diff --git a/chainbase/src/main/java/org/tron/core/service/MortgageService.java b/chainbase/src/main/java/org/tron/core/service/MortgageService.java
index f0182503ae8..b1fd279c2db 100644
--- a/chainbase/src/main/java/org/tron/core/service/MortgageService.java
+++ b/chainbase/src/main/java/org/tron/core/service/MortgageService.java
@@ -182,7 +182,7 @@ private long computeReward(long cycle, List<Pair<byte[], Long>> votes) {
       }
       long userVote = vote.getValue();
       double voteRate = (double) userVote / totalVote;
-      reward += (long) (voteRate * totalReward);
+      reward += voteRate * totalReward;
     }
     return reward;
   }
diff --git a/crypto/src/main/java/org/tron/common/crypto/Rsv.java b/crypto/src/main/java/org/tron/common/crypto/Rsv.java
index 136a77a4592..15c8498e836 100644
--- a/crypto/src/main/java/org/tron/common/crypto/Rsv.java
+++ b/crypto/src/main/java/org/tron/common/crypto/Rsv.java
@@ -19,7 +19,7 @@ public static Rsv fromSignature(byte[] sign) {
     byte[] s = Arrays.copyOfRange(sign, 32, 64);
     byte v = sign[64];
     if (v < 27) {
-      v += (byte) 27; //revId -> v
+      v += 27; //revId -> v
     }
     return new Rsv(r, s, v);
   }
diff --git a/framework/src/main/java/org/tron/core/capsule/utils/RLP.java b/framework/src/main/java/org/tron/core/capsule/utils/RLP.java
index e5ace11206d..24b5c502a1c 100644
--- a/framework/src/main/java/org/tron/core/capsule/utils/RLP.java
+++ b/framework/src/main/java/org/tron/core/capsule/utils/RLP.java
@@ -165,7 +165,7 @@ static short decodeShort(byte[] data, int index) {
       byte pow = (byte) (length - 1);
       for (int i = 1; i <= length; ++i) {
         // << (8 * pow) == bit shift to 0 (*1), 8 (*256) , 16 (*65..)
-        value += (short) ((data[index + i] & 0xFF) << (8 * pow));
+        value += (data[index + i] & 0xFF) << (8 * pow);
         pow--;
       }
     } else {
diff --git a/framework/src/main/java/org/tron/core/zen/address/SpendingKey.java b/framework/src/main/java/org/tron/core/zen/address/SpendingKey.java
index f7f030d00e2..18f18af3742 100644
--- a/framework/src/main/java/org/tron/core/zen/address/SpendingKey.java
+++ b/framework/src/main/java/org/tron/core/zen/address/SpendingKey.java
@@ -89,7 +89,7 @@ public DiversifierT defaultDiversifier() throws BadItemException, ZksnarkExcepti
           throw new BadItemException(
               "librustzcash_check_diversifier does not return valid diversifier");
         }
-        blob[33] += (byte) 1;
+        blob[33] += 1;
       } finally {
         JLibsodium.freeState(state);
       }