diff --git a/build/mining_reward_test.go b/build/mining_reward_test.go
new file mode 100644
index 000000000..9629623ed
--- /dev/null
+++ b/build/mining_reward_test.go
@@ -0,0 +1,12 @@
+package build
+
+import (
+	"math/big"
+	"testing"
+)
+
+func TestEncodeMiningRewardInitial(t *testing.T) {
+	i := &big.Int{}
+	i.SetString("153686558225539943338", 10)
+	t.Logf("%#v", i.Bytes())
+}
diff --git a/build/params.go b/build/params.go
index d165fa6c6..0ee462a68 100644
--- a/build/params.go
+++ b/build/params.go
@@ -29,6 +29,9 @@ const CollateralPrecision = 100
 
 const TotalFilecoin = 2000000000
 const MiningRewardTotal = 1400000000
+
+var MiningRewardInitialAttoFilBytes = []byte{0x8, 0x54, 0xd4, 0x56, 0x70, 0x99, 0xb2, 0x4b, 0xaa}
+
 const FilecoinPrecision = 1000000000000000000
 
 // six years
diff --git a/chain/gen/mining.go b/chain/gen/mining.go
index fb35cce4f..a691c5db5 100644
--- a/chain/gen/mining.go
+++ b/chain/gen/mining.go
@@ -42,9 +42,13 @@ func MinerCreateBlock(ctx context.Context, sm *stmgr.StateManager, w *wallet.Wal
 	if err != nil {
 		return nil, xerrors.Errorf("failed to get miner worker: %w", err)
 	}
+	networkBalance, err := vmi.ActorBalance(actors.NetworkAddress)
+	if err != nil {
+		return nil, xerrors.Errorf("failed to get network balance: %w", err)
+	}
 
 	// apply miner reward
-	if err := vmi.TransferFunds(actors.NetworkAddress, owner, vm.MiningRewardForBlock(height)); err != nil {
+	if err := vmi.TransferFunds(actors.NetworkAddress, owner, vm.MiningReward(networkBalance)); err != nil {
 		return nil, err
 	}
 
diff --git a/chain/sync.go b/chain/sync.go
index a7eae3c3b..2cf6239fa 100644
--- a/chain/sync.go
+++ b/chain/sync.go
@@ -441,8 +441,13 @@ func (syncer *Syncer) ValidateBlock(ctx context.Context, b *types.FullBlock) err
 	if err != nil {
 		return xerrors.Errorf("getting miner owner for block miner failed: %w", err)
 	}
+	networkBalance, err := vmi.ActorBalance(actors.NetworkAddress)
+	if err != nil {
+		return xerrors.Errorf("getting network balance")
+	}
 
-	if err := vmi.TransferFunds(actors.NetworkAddress, owner, vm.MiningRewardForBlock(h.Height)); err != nil {
+	if err := vmi.TransferFunds(actors.NetworkAddress, owner,
+		vm.MiningReward(networkBalance)); err != nil {
 		return xerrors.Errorf("fund transfer failed: %w", err)
 	}
 
diff --git a/chain/vm/vm.go b/chain/vm/vm.go
index 791496678..3cd88a2c9 100644
--- a/chain/vm/vm.go
+++ b/chain/vm/vm.go
@@ -3,7 +3,6 @@ package vm
 import (
 	"context"
 	"fmt"
-	"math"
 	"math/big"
 
 	"github.com/filecoin-project/go-lotus/build"
@@ -634,6 +633,18 @@ func DepositFunds(act *types.Actor, amt types.BigInt) {
 	act.Balance = types.BigAdd(act.Balance, amt)
 }
 
+// MiningReward returns correct mining reward
+//   coffer is amount of FIL in NetworkAddress
+func MiningReward(coffer types.BigInt) types.BigInt {
+	i := &big.Int{}
+	i.SetBytes(build.MiningRewardInitialAttoFilBytes)
+	IV := types.BigInt{i}
+	res := types.BigMul(IV, coffer)
+	res = types.BigDiv(res, types.FromFil(build.MiningRewardTotal))
+	return res
+}
+
+/*
 func MiningRewardForBlock(height uint64) types.BigInt {
 
 	//decay := e^(ln(0.5) / (HalvingPeriodBlocks / AdjustmentPeriod)
@@ -654,3 +665,4 @@ func MiningRewardForBlock(height uint64) types.BigInt {
 
 	return types.BigInt{reward}
 }
+*/
diff --git a/chain/vm/vm_test.go b/chain/vm/vm_test.go
index 0cf9e53e0..b1fcc34c4 100644
--- a/chain/vm/vm_test.go
+++ b/chain/vm/vm_test.go
@@ -2,6 +2,7 @@ package vm
 
 import (
 	"fmt"
+	"os"
 	"testing"
 
 	"github.com/filecoin-project/go-lotus/build"
@@ -9,14 +10,38 @@ import (
 )
 
 func TestBlockReward(t *testing.T) {
+	coffer := types.FromFil(build.MiningRewardTotal)
 	sum := types.NewInt(0)
-	for i := 0; i < 500000000; i += 60 {
-		sum = types.BigAdd(sum, MiningRewardForBlock(uint64(i)))
+	N := build.HalvingPeriodBlocks
+	for i := 0; i < N; i++ {
+		if i%20000 == 0 {
+			fmt.Fprintf(os.Stderr, "%.1f%%\r", float64(i)/float64(N)*100)
+		}
+
+		a := MiningReward(coffer)
+		sum = types.BigAdd(sum, a)
+		coffer = types.BigSub(coffer, a)
 	}
 
-	sum = types.BigMul(sum, types.NewInt(60))
+	//sum = types.BigMul(sum, types.NewInt(60))
 
-	fmt.Println(sum)
+	fmt.Println("After a halving period")
+	fmt.Printf("Total reward: %d\n", build.MiningRewardTotal)
+	fmt.Printf("Remaining: %s\n", types.BigDiv(coffer, types.NewInt(build.FilecoinPrecision)))
+	fmt.Printf("Given out: %s\n", types.BigDiv(sum, types.NewInt(build.FilecoinPrecision)))
 
-	fmt.Println(types.BigDiv(sum, types.NewInt(build.FilecoinPrecision)))
+	for i := 0; i < N; i++ {
+		if i%20000 == 0 {
+			fmt.Fprintf(os.Stderr, "%.1f%%\r", float64(i)/float64(N)*100)
+		}
+
+		a := MiningReward(coffer)
+		sum = types.BigAdd(sum, a)
+		coffer = types.BigSub(coffer, a)
+	}
+
+	fmt.Println("Next halving period")
+	fmt.Printf("Total reward: %d\n", build.MiningRewardTotal)
+	fmt.Printf("Remaining: %s\n", types.BigDiv(coffer, types.NewInt(build.FilecoinPrecision)))
+	fmt.Printf("Given out: %s\n", types.BigDiv(sum, types.NewInt(build.FilecoinPrecision)))
 }