diff --git a/backend/src/main/kotlin/com/wrbug/polymarketbot/service/copytrading/statistics/CopyOrderTrackingService.kt b/backend/src/main/kotlin/com/wrbug/polymarketbot/service/copytrading/statistics/CopyOrderTrackingService.kt
index 73a6b21..913ad9f 100644
--- a/backend/src/main/kotlin/com/wrbug/polymarketbot/service/copytrading/statistics/CopyOrderTrackingService.kt
+++ b/backend/src/main/kotlin/com/wrbug/polymarketbot/service/copytrading/statistics/CopyOrderTrackingService.kt
@@ -376,15 +376,46 @@ open class CopyOrderTrackingService(
                     // 验证订单数量限制（仅比例模式）
                     var finalBuyQuantity = buyQuantity
                     if (copyTrading.copyMode == "RATIO") {
-                        val orderAmount = buyQuantity.multi(trade.price.toSafeBigDecimal())
-                        if (orderAmount.lt(copyTrading.minOrderSize)) {
-                            logger.warn("订单金额低于最小限制，跳过: copyTradingId=${copyTrading.id}, amount=$orderAmount, min=${copyTrading.minOrderSize}")
-                            continue
+                        val tradePrice = trade.price.toSafeBigDecimal()
+                        val rawOrderAmount = buyQuantity.multi(tradePrice)
+                        
+                        // 对按比例计算的金额进行向上取整处理（确保满足最小限制）
+                        // 向上取整到 2 位小数（USDC 精度）
+                        val roundedOrderAmount = rawOrderAmount.setScale(2, java.math.RoundingMode.CEILING)
+                        
+                        // 如果原始金额或向上取整后的金额小于最小限制，调整 buyQuantity 以满足最小限制
+                        // 这样可以避免精度问题导致订单被错误地跳过
+                        if (roundedOrderAmount.lt(copyTrading.minOrderSize)) {
+                            logger.debug("订单金额（向上取整后）低于最小限制，调整数量以满足最小限制: copyTradingId=${copyTrading.id}, rawAmount=$rawOrderAmount, roundedAmount=$roundedOrderAmount, min=${copyTrading.minOrderSize}")
+                            // 计算满足最小限制所需的数量（向上取整）
+                            val minQuantity = copyTrading.minOrderSize.div(tradePrice, 8, java.math.RoundingMode.CEILING)
+                            if (minQuantity.lte(BigDecimal.ZERO)) {
+                                logger.warn("计算出的最小数量为0或负数，跳过: copyTradingId=${copyTrading.id}")
+                                continue
+                            }
+                            // 使用调整后的数量
+                            finalBuyQuantity = minQuantity
+                            logger.debug("已调整数量以满足最小限制: copyTradingId=${copyTrading.id}, originalQuantity=$buyQuantity, adjustedQuantity=$finalBuyQuantity, adjustedAmount=${finalBuyQuantity.multi(tradePrice)}")
+                        } else if (rawOrderAmount.lt(copyTrading.minOrderSize)) {
+                            // 原始金额小于最小限制，但向上取整后满足，调整数量以满足最小限制
+                            logger.debug("订单金额（精度处理后）低于最小限制，调整数量以满足最小限制: copyTradingId=${copyTrading.id}, rawAmount=$rawOrderAmount, min=${copyTrading.minOrderSize}")
+                            // 计算满足最小限制所需的数量（向上取整）
+                            val minQuantity = copyTrading.minOrderSize.div(tradePrice, 8, java.math.RoundingMode.CEILING)
+                            if (minQuantity.lte(BigDecimal.ZERO)) {
+                                logger.warn("计算出的最小数量为0或负数，跳过: copyTradingId=${copyTrading.id}")
+                                continue
+                            }
+                            // 使用调整后的数量
+                            finalBuyQuantity = minQuantity
+                            logger.debug("已调整数量以满足最小限制: copyTradingId=${copyTrading.id}, originalQuantity=$buyQuantity, adjustedQuantity=$finalBuyQuantity, adjustedAmount=${finalBuyQuantity.multi(tradePrice)}")
                         }
-                        if (orderAmount.gt(copyTrading.maxOrderSize)) {
-                            logger.warn("订单金额超过最大限制，调整数量: copyTradingId=${copyTrading.id}, amount=$orderAmount, max=${copyTrading.maxOrderSize}")
+                        
+                        // 检查最大限制（使用调整后的数量）
+                        val finalOrderAmount = finalBuyQuantity.multi(tradePrice)
+                        if (finalOrderAmount.gt(copyTrading.maxOrderSize)) {
+                            logger.warn("订单金额超过最大限制，调整数量: copyTradingId=${copyTrading.id}, amount=$finalOrderAmount, max=${copyTrading.maxOrderSize}")
                             // 调整数量到最大值
-                            val adjustedQuantity = copyTrading.maxOrderSize.div(trade.price.toSafeBigDecimal())
+                            val adjustedQuantity = copyTrading.maxOrderSize.div(tradePrice, 8, java.math.RoundingMode.DOWN)
                             if (adjustedQuantity.lte(BigDecimal.ZERO)) {
                                 logger.warn("调整后的数量为0或负数，跳过: copyTradingId=${copyTrading.id}")
                                 continue
diff --git a/backend/src/main/kotlin/com/wrbug/polymarketbot/util/MathExt.kt b/backend/src/main/kotlin/com/wrbug/polymarketbot/util/MathExt.kt
index 826412b..7102604 100644
--- a/backend/src/main/kotlin/com/wrbug/polymarketbot/util/MathExt.kt
+++ b/backend/src/main/kotlin/com/wrbug/polymarketbot/util/MathExt.kt
@@ -26,21 +26,23 @@ fun BigDecimal.multi(value: Any): BigDecimal {
     return BigDecimal.ZERO
 }
 
+
 /**
- * BigDecimal除法扩展函数
+ * BigDecimal除法扩展函数（带精度和舍入模式）
  * 安全地将BigDecimal与任意数值类型相除
  * @param value 除数，支持BigDecimal、BigInteger类型或可转换为BigDecimal的字符串
- * @return 除法结果，精度为18位小数，使用四舍五入模式，如果转换失败返回IllegalBigDecimal
+ * @param scale 精度（小数位数）
+ * @param roundingMode 舍入模式
+ * @return 除法结果，如果转换失败返回IllegalBigDecimal
  */
-fun BigDecimal.div(value: Any): BigDecimal {
+fun BigDecimal.div(value: Any, scale: Int = 18, roundingMode: RoundingMode = RoundingMode.HALF_UP): BigDecimal {
     kotlin.runCatching {
-        if (value is BigDecimal) {
-            return divide(value, 18, RoundingMode.HALF_UP).stripTrailingZeros()
+        val divisor = when (value) {
+            is BigDecimal -> value
+            is BigInteger -> value.toBigDecimal()
+            else -> BigDecimal(value.toString())
         }
-        if (value is BigInteger) {
-            return divide(value.toSafeBigDecimal(), 18, RoundingMode.HALF_UP).stripTrailingZeros()
-        }
-        return divide(BigDecimal(value.toString()), 18, RoundingMode.HALF_UP).stripTrailingZeros()
+        return divide(divisor, scale, roundingMode)
     }
     return IllegalBigDecimal
 }