diff --git a/backend/mpc-system/services/service-party-android/contracts/KAVA_NETWORK.md b/backend/mpc-system/services/service-party-android/contracts/KAVA_NETWORK.md
index 570edbe1..14b0f722 100644
--- a/backend/mpc-system/services/service-party-android/contracts/KAVA_NETWORK.md
+++ b/backend/mpc-system/services/service-party-android/contracts/KAVA_NETWORK.md
@@ -106,10 +106,10 @@ Kava EVM 兼容以太坊 EVM，支持:
 | 代币 | 地址 |
 |------|------|
 | WKAVA (Wrapped KAVA) | `0xc86c7C0eFbd6A49B35E8714C5f59D99De09A225b` |
-| USDT | `0x919C1c267BC06a7039e03fcc2eF738525769109c` |
+| USDT (官方) | `0x919C1c267BC06a7039e03fcc2eF738525769109c` |
 | USDC | `0xfA9343C3897324496A05fC75abeD6bAC29f8A40f` |
 | DAI | `0x765277EebeCA2e31912C9946eAe1021199B39C61` |
-| dUSDT (Durian USDT) | `0xA9F3A35dBa8699c8C681D8db03F0c1A8CEB9D7c3` |
+| **dUSDT (绿积分)** | `0xA9F3A35dBa8699c8C681D8db03F0c1A8CEB9D7c3` ⭐ 当前使用 |
 
 ## 资源链接
 
diff --git a/backend/services/blockchain-service/.env.example b/backend/services/blockchain-service/.env.example
index ef95e72f..947d36d0 100644
--- a/backend/services/blockchain-service/.env.example
+++ b/backend/services/blockchain-service/.env.example
@@ -57,8 +57,9 @@ KAFKA_GROUP_ID=blockchain-service-group
 # Official KAVA EVM RPC endpoint
 KAVA_RPC_URL=https://evm.kava.io
 KAVA_CHAIN_ID=2222
-# KAVA USDT contract address
-KAVA_USDT_CONTRACT=0x919C1c267BC06a7039e03fcc2eF738525769109c
+# dUSDT (绿积分) 合约地址 - Durian USDT, 精度6位
+# 合约链接: https://kavascan.com/address/0xA9F3A35dBa8699c8C681D8db03F0c1A8CEB9D7c3
+KAVA_USDT_CONTRACT=0xA9F3A35dBa8699c8C681D8db03F0c1A8CEB9D7c3
 
 # =============================================================================
 # Blockchain - BSC (Binance Smart Chain)
diff --git a/backend/services/blockchain-service/src/config/blockchain.config.ts b/backend/services/blockchain-service/src/config/blockchain.config.ts
index c0178a53..b7c7e012 100644
--- a/backend/services/blockchain-service/src/config/blockchain.config.ts
+++ b/backend/services/blockchain-service/src/config/blockchain.config.ts
@@ -39,7 +39,8 @@ export default registerAs('blockchain', () => {
           // KAVA Mainnet
           rpcUrl: process.env.KAVA_RPC_URL || 'https://evm.kava.io',
           chainId: parseInt(process.env.KAVA_CHAIN_ID || '2222', 10),
-          usdtContract: process.env.KAVA_USDT_CONTRACT || '0x919C1c267BC06a7039e03fcc2eF738525769109c',
+          // dUSDT (绿积分) 合约地址 - Durian USDT, 精度6位
+          usdtContract: process.env.KAVA_USDT_CONTRACT || '0xA9F3A35dBa8699c8C681D8db03F0c1A8CEB9D7c3',
           confirmations: parseInt(process.env.KAVA_CONFIRMATIONS || '12', 10),
         },
 
diff --git a/backend/services/blockchain-service/src/domain/services/chain-config.service.ts b/backend/services/blockchain-service/src/domain/services/chain-config.service.ts
index 29f86e68..3c303a81 100644
--- a/backend/services/blockchain-service/src/domain/services/chain-config.service.ts
+++ b/backend/services/blockchain-service/src/domain/services/chain-config.service.ts
@@ -42,9 +42,10 @@ export class ChainConfigService {
         'blockchain.kava.rpcUrl',
         this.isTestnet ? 'https://evm.testnet.kava.io' : 'https://evm.kava.io',
       ),
+      // dUSDT (绿积分) 合约地址 - Durian USDT, 精度6位
       usdtContract: this.configService.get<string>(
         'blockchain.kava.usdtContract',
-        this.isTestnet ? '0x0000000000000000000000000000000000000000' : '0x919C1c267BC06a7039e03fcc2eF738525769109c',
+        this.isTestnet ? '0x0000000000000000000000000000000000000000' : '0xA9F3A35dBa8699c8C681D8db03F0c1A8CEB9D7c3',
       ),
       nativeSymbol: 'KAVA',
       blockTime: 6,
diff --git a/backend/services/docker-compose.yml b/backend/services/docker-compose.yml
index b1ee6b25..953ecf6c 100644
--- a/backend/services/docker-compose.yml
+++ b/backend/services/docker-compose.yml
@@ -667,20 +667,15 @@ services:
       - KAFKA_CLIENT_ID=blockchain-service
       - KAFKA_GROUP_ID=blockchain-service-group
       # 网络模式: mainnet 或 testnet
-      - NETWORK_MODE=testnet
-      # 主网配置 (NETWORK_MODE=mainnet 时使用)
-      # - KAVA_RPC_URL=https://evm.kava.io
-      # - KAVA_CHAIN_ID=2222
-      # - KAVA_USDT_CONTRACT=0x919C1c267BC06a7039e03fcc2eF738525769109c
+      - NETWORK_MODE=mainnet
+      # 主网配置 - dUSDT (绿积分) 合约
+      - KAVA_RPC_URL=https://evm.kava.io
+      - KAVA_CHAIN_ID=2222
+      - KAVA_USDT_CONTRACT=0xA9F3A35dBa8699c8C681D8db03F0c1A8CEB9D7c3
+      # BSC 主网 (暂未使用)
       # - BSC_RPC_URL=https://bsc-dataseed.binance.org
       # - BSC_CHAIN_ID=56
       # - BSC_USDT_CONTRACT=0x55d398326f99059fF775485246999027B3197955
-      # 测试网配置 (NETWORK_MODE=testnet 时使用)
-      # - KAVA_RPC_URL=https://evm.testnet.kava.io
-      # - KAVA_CHAIN_ID=2221
-      # - BSC_RPC_URL=https://data-seed-prebsc-1-s1.binance.org:8545
-      # - BSC_CHAIN_ID=97
-      # - BSC_USDT_CONTRACT=0x337610d27c682E347C9cD60BD4b3b107C9d34dDd
       # MPC Hot Wallet (用于提现转账)
       - MPC_SERVICE_URL=http://rwa-mpc-service:3006
       - HOT_WALLET_USERNAME=${HOT_WALLET_USERNAME:-}