diff --git a/backend/services/mining-service/src/application/services/batch-mining.service.ts b/backend/services/mining-service/src/application/services/batch-mining.service.ts
index 50697f45..f5c8a585 100644
--- a/backend/services/mining-service/src/application/services/batch-mining.service.ts
+++ b/backend/services/mining-service/src/application/services/batch-mining.service.ts
@@ -136,11 +136,11 @@ export class BatchMiningService {
   /**
    * 预览批量补发（计算但不执行）
    *
-   * 分阶段计算逻辑：
-   * - 阶段1（3天）：只有批次1在挖，批次1独占全部产出
-   * - 阶段2（2天）：批次1+2一起挖，按算力比例分
-   * - 阶段3（1天）：批次1+2+3一起挖，按算力比例分
-   * - 阶段4（剩余天数）：所有批次一起挖到今天
+   * 简化计算逻辑：
+   * - 每日产出 = 每秒分配量 × 86400
+   * - 用户收益 = (用户算力 / 全网算力) × 每日产出 × 天数
+   * - 用户占全网70%，所以全网算力 = 用户算力 / 0.7
+   * - 公式验证: (1000000/365/2)*70%*74 = 70958.90411
    */
   async preview(items: BatchMiningItem[]): Promise<BatchMiningPreviewResult> {
     this.logger.log(`[preview] 开始预览批量补发, 共 ${items.length} 条数据`);
@@ -170,7 +170,8 @@ export class BatchMiningService {
     }
 
     const secondDistribution = config.secondDistribution.value;
-    this.logger.log(`[preview] 每秒分配量: ${secondDistribution.toString()}`);
+    const dailyDistribution = secondDistribution.times(SECONDS_PER_DAY);
+    this.logger.log(`[preview] 每秒分配量: ${secondDistribution.toString()}, 每日分配量: ${dailyDistribution.toFixed(6)}`);
 
     // 按批次分组并排序
     const batchGroups = this.groupByBatch(items);
@@ -189,61 +190,40 @@ export class BatchMiningService {
       this.logger.log(`[preview] 批次${batchNum}算力: ${batchTotal.toFixed(2)}`);
     }
 
-    // 计算每个用户的算力
-    const userContributions = new Map<string, Decimal>();
-    for (const item of items) {
-      userContributions.set(item.accountSequence, this.calculateUserContribution(item.treeCount));
+    // 计算用户总算力和全网算力
+    let totalUserContribution = new Decimal(0);
+    for (const contribution of batchContributions.values()) {
+      totalUserContribution = totalUserContribution.plus(contribution);
     }
+    // 用户只占全网的70%（30%是系统、运营、层级、团队），所以全网算力 = 用户算力 / 0.7
+    const networkContribution = totalUserContribution.dividedBy(USER_NETWORK_RATIO);
+    this.logger.log(`[preview] 用户总算力: ${totalUserContribution.toFixed(2)}, 全网算力(用户占70%): ${networkContribution.toFixed(2)}`);
 
-    // 定义挖矿阶段
-    // 阶段1: 批次1独挖3天
-    // 阶段2: 批次1+2共挖2天
-    // 阶段3: 批次1+2+3共挖1天
-    // 阶段4: 所有批次共挖（剩余天数）
-    const phases = this.buildMiningPhases(items, sortedBatches, batchContributions);
-    this.logger.log(`[preview] 挖矿阶段: ${JSON.stringify(phases.map(p => ({
-      phase: p.phaseNumber,
-      days: p.daysInPhase,
-      batches: p.participatingBatches,
-      networkContribution: p.networkContribution.toFixed(2)
-    })))}`);
+    // 获取最大总挖矿天数
+    let maxTotalMiningDays = 0;
+    for (const item of items) {
+      if (item.totalMiningDays && item.totalMiningDays > maxTotalMiningDays) {
+        maxTotalMiningDays = item.totalMiningDays;
+      }
+    }
+    this.logger.log(`[preview] 最大总挖矿天数: ${maxTotalMiningDays}`);
 
-    // 计算每个用户在各阶段的收益
+    // 简化计算：所有用户按各自的总挖矿天数计算收益
+    // 用户收益 = (用户算力 / 全网算力) × 每日产出 × 天数
     const userAmounts = new Map<string, Decimal>();
     for (const item of items) {
-      userAmounts.set(item.accountSequence, new Decimal(0));
-    }
-
-    for (const phase of phases) {
-      const dailyDistribution = secondDistribution.times(SECONDS_PER_DAY);
-      const phaseDistribution = dailyDistribution.times(phase.daysInPhase);
-
-      for (const item of items) {
-        // 检查该用户的批次是否参与此阶段
-        if (phase.participatingBatches.includes(item.batch)) {
-          const userContribution = userContributions.get(item.accountSequence)!;
-          const ratio = userContribution.dividedBy(phase.networkContribution);
-          const phaseAmount = phaseDistribution.times(ratio);
-
-          const currentAmount = userAmounts.get(item.accountSequence)!;
-          userAmounts.set(item.accountSequence, currentAmount.plus(phaseAmount));
-        }
-      }
+      const userContribution = this.calculateUserContribution(item.treeCount);
+      const ratio = userContribution.dividedBy(networkContribution);
+      const days = item.totalMiningDays || maxTotalMiningDays;
+      const amount = dailyDistribution.times(ratio).times(days);
+      userAmounts.set(item.accountSequence, amount);
+      this.logger.debug(`[preview] 用户 ${item.accountSequence}: 算力=${userContribution.toFixed(2)}, 占比=${ratio.toFixed(6)}, 天数=${days}, 金额=${amount.toFixed(8)}`);
     }
 
     // 构建返回结果
     let grandTotalAmount = new Decimal(0);
     const batchResults: BatchMiningPreviewResult['batches'] = [];
 
-    // 计算累计全网算力（最终状态）
-    // 用户只占全网的70%（30%是系统、运营、层级、团队），所以全网算力 = 用户算力 / 0.7
-    let totalUserContribution = new Decimal(0);
-    for (const contribution of batchContributions.values()) {
-      totalUserContribution = totalUserContribution.plus(contribution);
-    }
-    const finalNetworkContribution = totalUserContribution.dividedBy(USER_NETWORK_RATIO);
-    this.logger.log(`[preview] 用户总算力: ${totalUserContribution.toFixed(2)}, 全网算力(用户占70%): ${finalNetworkContribution.toFixed(2)}`);
-
     for (const batchNum of sortedBatches) {
       const batchItems = batchGroups.get(batchNum)!;
       const batchContribution = batchContributions.get(batchNum)!;