diff --git a/chain33.fork.toml b/chain33.fork.toml
index 79c79eece..8743e0e11 100644
--- a/chain33.fork.toml
+++ b/chain33.fork.toml
@@ -162,6 +162,7 @@ Enable=0
 
 [fork.sub.lottery]
 Enable=0
+ForkLotteryFixOverflow=0
 
 [fork.sub.mix]
 Enable=0
diff --git a/chain33.para.toml b/chain33.para.toml
index 00afc4248..906914e8e 100644
--- a/chain33.para.toml
+++ b/chain33.para.toml
@@ -447,6 +447,7 @@ Enable=0
 
 [fork.sub.lottery]
 Enable=0
+ForkLotteryFixOverflow=0
 
 [fork.sub.oracle]
 Enable=0
diff --git a/plugin/dapp/evm/cmd/ci2/chain33.proxyminer.toml b/plugin/dapp/evm/cmd/ci2/chain33.proxyminer.toml
index 1316dafbb..4c100dd63 100644
--- a/plugin/dapp/evm/cmd/ci2/chain33.proxyminer.toml
+++ b/plugin/dapp/evm/cmd/ci2/chain33.proxyminer.toml
@@ -670,6 +670,7 @@ Enable=0
 
 [fork.sub.lottery]
 Enable=0
+ForkLotteryFixOverflow=0
 
 [fork.sub.mix]
 Enable=0
diff --git a/plugin/dapp/lottery/executor/lottery_fix_overflow_test.go b/plugin/dapp/lottery/executor/lottery_fix_overflow_test.go
new file mode 100644
index 000000000..22d56d45d
--- /dev/null
+++ b/plugin/dapp/lottery/executor/lottery_fix_overflow_test.go
@@ -0,0 +1,238 @@
+// Copyright Fuzamei Corp. 2018 All Rights Reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package executor
+
+// Regression tests for the LotteryBuy amount overflow fix (ForkLotteryFixOverflow):
+//  1. buy.Amount * CoinPrecision int64 overflow is rejected after the fork
+//  2. pre-fork behavior is unchanged (old bookkeeping kept for consensus compatibility)
+//  3. normal buy/draw/close paths are not affected by the fix
+
+import (
+	"encoding/binary"
+	"testing"
+
+	"github.com/33cn/chain33/client"
+	"github.com/33cn/chain33/common"
+	"github.com/33cn/chain33/common/address"
+	"github.com/33cn/chain33/common/crypto"
+	dbm "github.com/33cn/chain33/common/db"
+	"github.com/33cn/chain33/queue"
+	drivers "github.com/33cn/chain33/system/dapp"
+	manageTy "github.com/33cn/chain33/system/dapp/manage/types"
+	"github.com/33cn/chain33/types"
+	"github.com/33cn/chain33/util"
+	rt "github.com/33cn/plugin/plugin/dapp/lottery/types"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// fixOverflowBuyAmount makes amount*1e8 wrap around to a small positive value 90448384 (~0.9 coin),
+// while Fund/AmountOneRound would be recorded as 184467440738 before the fix
+const fixOverflowBuyAmount = int64(184467440738)
+
+type lotteryFixOverflowEnv struct {
+	exec      drivers.Driver
+	db        dbm.KV
+	q         queue.Queue
+	cfg       *types.Chain33Config
+	creator   string
+	creatorPk crypto.PrivKey
+	buyer     string
+	buyerPk   crypto.PrivKey
+	lotteryID string
+	nonce     int64
+}
+
+// newLotteryFixOverflowEnv builds an isolated lottery executor env.
+// The driver is registered once by the existing init() in lottery_test.go.
+func newLotteryFixOverflowEnv(t *testing.T, cfg *types.Chain33Config) *lotteryFixOverflowEnv {
+	env := &lotteryFixOverflowEnv{}
+	env.creator, env.creatorPk = genaddress()
+	env.buyer, env.buyerPk = genaddress()
+
+	if cfg == nil {
+		cfg = types.NewChain33Config(types.GetDefaultCfgstring())
+	}
+	env.cfg = cfg
+	lott := newLottery()
+	_, _, kvdb := util.CreateTestDB()
+	env.db = kvdb
+	q := queue.New("channel")
+	q.SetConfig(cfg)
+	env.q = q
+	api, _ := client.New(q.Client(), nil)
+	lott.SetAPI(api)
+	lott.SetExecutorAPI(api, nil)
+	lott.SetStateDB(kvdb)
+	lott.SetLocalDB(kvdb)
+	env.exec = lott
+
+	// configure lottery-creator manage privilege
+	var item types.ConfigItem
+	item.Key = creatorKey
+	item.Ty = manageTy.ConfigItemArrayConfig
+	arr := types.ConfigItem_Arr{Arr: &types.ArrayConfig{Value: []string{env.creator}}}
+	item.Value = &arr
+	err := env.db.Set([]byte(types.ManageKey(creatorKey)), types.Encode(&item))
+	require.Nil(t, err)
+	return env
+}
+
+func (env *lotteryFixOverflowEnv) nextNonce() int64 {
+	env.nonce++
+	return env.nonce
+}
+
+func (env *lotteryFixOverflowEnv) createLottery(t *testing.T) {
+	vc := &rt.LotteryAction_Create{Create: &rt.LotteryCreate{
+		PurBlockNum: minPurBlockNum, DrawBlockNum: minDrawBlockNum, OpRewardRatio: 10, DevRewardRatio: 10}}
+	action := &rt.LotteryAction{Value: vc, Ty: rt.LotteryActionCreate}
+	tx := &types.Transaction{Execer: []byte("lottery"), Payload: types.Encode(action), Fee: 1e6,
+		To: address.ExecAddress(env.cfg.ExecName(rt.LotteryX)), Nonce: env.nextNonce()}
+	tx.Sign(types.SECP256K1, env.creatorPk)
+	env.exec.SetEnv(1, 1000, 0)
+	_, err := env.exec.Exec(tx, 0)
+	require.Nil(t, err)
+	env.lotteryID = common.ToHex(tx.Hash())
+}
+
+func (env *lotteryFixOverflowEnv) buyTx(amount, number, way int64) *types.Transaction {
+	vb := &rt.LotteryAction_Buy{Buy: &rt.LotteryBuy{LotteryId: env.lotteryID, Amount: amount, Number: number, Way: way}}
+	action := &rt.LotteryAction{Value: vb, Ty: rt.LotteryActionBuy}
+	tx := &types.Transaction{Execer: []byte("lottery"), Payload: types.Encode(action), Fee: 1e6,
+		To: address.ExecAddress(env.cfg.ExecName(rt.LotteryX)), Nonce: env.nextNonce()}
+	tx.Sign(types.SECP256K1, env.buyerPk)
+	return tx
+}
+
+func (env *lotteryFixOverflowEnv) drawTx() *types.Transaction {
+	vd := &rt.LotteryAction_Draw{Draw: &rt.LotteryDraw{LotteryId: env.lotteryID}}
+	action := &rt.LotteryAction{Value: vd, Ty: rt.LotteryActionDraw}
+	tx := &types.Transaction{Execer: []byte("lottery"), Payload: types.Encode(action), Fee: 1e6,
+		To: address.ExecAddress(env.cfg.ExecName(rt.LotteryX)), Nonce: env.nextNonce()}
+	tx.Sign(types.SECP256K1, env.creatorPk)
+	return tx
+}
+
+func (env *lotteryFixOverflowEnv) closeTx() *types.Transaction {
+	vc := &rt.LotteryAction_Close{Close: &rt.LotteryClose{LotteryId: env.lotteryID}}
+	action := &rt.LotteryAction{Value: vc, Ty: rt.LotteryActionClose}
+	tx := &types.Transaction{Execer: []byte("lottery"), Payload: types.Encode(action), Fee: 1e6,
+		To: address.ExecAddress(env.cfg.ExecName(rt.LotteryX)), Nonce: env.nextNonce()}
+	tx.Sign(types.SECP256K1, env.creatorPk)
+	return tx
+}
+
+func (env *lotteryFixOverflowEnv) fundBuyer(balance int64) {
+	execaddr := address.ExecAddress("lottery")
+	acc := env.exec.GetCoinsAccount().LoadExecAccount(env.buyer, execaddr)
+	acc.Balance = balance
+	env.exec.GetCoinsAccount().SaveExecAccount(execaddr, acc)
+}
+
+func (env *lotteryFixOverflowEnv) buyerBalance() int64 {
+	return env.exec.GetCoinsAccount().LoadExecAccount(env.buyer, address.ExecAddress("lottery")).Balance
+}
+
+func (env *lotteryFixOverflowEnv) creatorFrozen() int64 {
+	return env.exec.GetCoinsAccount().LoadExecAccount(env.creator, address.ExecAddress("lottery")).Frozen
+}
+
+func (env *lotteryFixOverflowEnv) loadLottery(t *testing.T) *rt.Lottery {
+	lott, err := findLottery(env.db, env.lotteryID)
+	require.Nil(t, err)
+	return lott
+}
+
+// mockRandNum mocks the ticket module RandNumHash query to control the lucky number
+func (env *lotteryFixOverflowEnv) mockRandNum(luckyNum uint32) {
+	luckyHash := make([]byte, 32)
+	binary.BigEndian.PutUint32(luckyHash[0:4], luckyNum)
+	c := env.q.Client()
+	c.Sub("execs")
+	go func() {
+		for msg := range c.Recv() {
+			if msg.Ty == types.EventBlockChainQuery {
+				data, ok := msg.GetData().(*types.ChainExecutor)
+				if ok && data.Driver == "ticket" && data.FuncName == "RandNumHash" {
+					msg.Reply(c.NewMessage("", types.EventBlockChainQuery, &types.ReplyHash{Hash: luckyHash}))
+					continue
+				}
+				msg.Reply(c.NewMessage("", types.EventBlockChainQuery, types.ErrNotSupport))
+			}
+		}
+	}()
+}
+
+// TestLotteryFixBuyOverflowRejected verifies that an overflowing buy amount is rejected after ForkLotteryFixOverflow
+func TestLotteryFixBuyOverflowRejected(t *testing.T) {
+	env := newLotteryFixOverflowEnv(t, nil)
+	require.True(t, env.cfg.IsDappFork(0, rt.LotteryX, rt.ForkLotteryFixOverflow))
+	env.createLottery(t)
+	env.fundBuyer(1e9)
+
+	// amount*CoinPrecision wraps to a small positive value, must be rejected
+	env.exec.SetEnv(2, 1001, 0)
+	_, err := env.exec.Exec(env.buyTx(fixOverflowBuyAmount, 12345, FiveStar), 0)
+	require.Equal(t, rt.ErrLotteryBuyAmount, err)
+
+	// amount exceeding the max coin supply must be rejected as well
+	_, err = env.exec.Exec(env.buyTx(types.MaxCoin, 12345, FiveStar), 0)
+	require.Equal(t, rt.ErrLotteryBuyAmount, err)
+
+	// no funds moved, no bookkeeping changed
+	assert.Equal(t, int64(1e9), env.buyerBalance())
+	assert.Equal(t, int64(0), env.creatorFrozen())
+	lott := env.loadLottery(t)
+	assert.Equal(t, int64(0), lott.Fund)
+	assert.Equal(t, int64(0), lott.BuyAmount)
+}
+
+// TestLotteryFixNormalBuyDraw verifies the normal buy/draw payout path is not affected
+func TestLotteryFixNormalBuyDraw(t *testing.T) {
+	env := newLotteryFixOverflowEnv(t, nil)
+	env.createLottery(t)
+	env.fundBuyer(100 * 1e8)
+	env.mockRandNum(12345)
+
+	env.exec.SetEnv(2, 1001, 0)
+	// buy 10 coins, FiveStar, number 12345, always wins with odds 100000
+	_, err := env.exec.Exec(env.buyTx(10, 12345, FiveStar), 0)
+	require.Nil(t, err)
+	assert.Equal(t, int64(10)*1e8, env.creatorFrozen())
+
+	env.exec.SetEnv(2+minDrawBlockNum, 2000, 0)
+	_, err = env.exec.Exec(env.drawTx(), 0)
+	require.Nil(t, err)
+
+	lott := env.loadLottery(t)
+	assert.EqualValues(t, rt.LotteryDrawed, lott.Status)
+	assert.Equal(t, int64(12345), lott.LuckyNumber)
+	// totalFund=10*100000=1e6 > Fund/2=5 => factor=1e8*10/2/1e6=500
+	// gain = 1e6*500*(1000-10-10)/1000 = 4.9e8; op=dev=500*1e6*10/1000=5e6
+	assert.Equal(t, int64(5), lott.Fund)
+	assert.Equal(t, int64(100)*1e8-int64(10)*1e8+int64(49)*1e7, env.buyerBalance())
+	assert.Equal(t, int64(10)*1e8-int64(49)*1e7-2*int64(5)*1e6, env.creatorFrozen())
+}
+
+// TestLotteryFixNormalBuyClose verifies the normal close refund path is not affected
+func TestLotteryFixNormalBuyClose(t *testing.T) {
+	env := newLotteryFixOverflowEnv(t, nil)
+	env.createLottery(t)
+	env.fundBuyer(100 * 1e8)
+
+	env.exec.SetEnv(2, 1001, 0)
+	_, err := env.exec.Exec(env.buyTx(10, 12345, FiveStar), 0)
+	require.Nil(t, err)
+
+	env.exec.SetEnv(3, 1002, 0)
+	_, err = env.exec.Exec(env.closeTx(), 0)
+	require.Nil(t, err)
+	assert.Equal(t, int64(100)*1e8, env.buyerBalance())
+	assert.Equal(t, int64(0), env.creatorFrozen())
+
+	lott := env.loadLottery(t)
+	assert.EqualValues(t, rt.LotteryClosed, lott.Status)
+}
diff --git a/plugin/dapp/lottery/executor/lotterydb.go b/plugin/dapp/lottery/executor/lotterydb.go
index 6ba4274ee..7aa0a1b87 100755
--- a/plugin/dapp/lottery/executor/lotterydb.go
+++ b/plugin/dapp/lottery/executor/lotterydb.go
@@ -5,6 +5,7 @@
 package executor
 
 import (
+	"math"
 	"strconv"
 
 	"github.com/33cn/chain33/account"
@@ -345,6 +346,14 @@ func (action *Action) LotteryBuy(buy *pty.LotteryBuy) (*types.Receipt, error) {
 		return nil, pty.ErrLotteryBuyAmount
 	}
 
+	if cfg.IsDappFork(action.height, pty.LotteryX, pty.ForkLotteryFixOverflow) {
+		//拒绝乘精度溢出或超过最大发行量的购买金额
+		if buy.GetAmount() >= types.MaxCoin || buy.GetAmount() > math.MaxInt64/cfg.GetCoinPrecision() {
+			llog.Error("LotteryBuy", "buyAmount overflow", buy.GetAmount())
+			return nil, pty.ErrLotteryBuyAmount
+		}
+	}
+
 	if buy.GetNumber() < 0 || buy.GetNumber() >= luckyNumMol {
 		llog.Error("LotteryBuy", "buyNumber", buy.GetNumber())
 		return nil, pty.ErrLotteryBuyNumber
diff --git a/plugin/dapp/lottery/types/lottery.go b/plugin/dapp/lottery/types/lottery.go
index ad3f3fca1..dc5e870ae 100755
--- a/plugin/dapp/lottery/types/lottery.go
+++ b/plugin/dapp/lottery/types/lottery.go
@@ -26,6 +26,7 @@ func init() {
 // InitFork ...
 func InitFork(cfg *types.Chain33Config) {
 	cfg.RegisterDappFork(LotteryX, "Enable", 0)
+	cfg.RegisterDappFork(LotteryX, ForkLotteryFixOverflow, 0)
 }
 
 // InitExecutor ...
diff --git a/plugin/dapp/lottery/types/types.go b/plugin/dapp/lottery/types/types.go
index a10ef7aa7..9a3e3b746 100755
--- a/plugin/dapp/lottery/types/types.go
+++ b/plugin/dapp/lottery/types/types.go
@@ -24,6 +24,12 @@ const (
 	LotteryX = "lottery"
 )
 
+// Fork for lottery
+const (
+	// ForkLotteryFixOverflow 修复购买金额溢出漏洞，LotteryBuy 在转账/冻结前增加金额上限与溢出检查
+	ForkLotteryFixOverflow = "ForkLotteryFixOverflow"
+)
+
 // Lottery status
 const (
 	LotteryCreated = 1 + iota