diff --git a/src/main/kotlin/model/ChartModels.kt b/src/main/kotlin/model/ChartModels.kt
index ee18566..124134c 100644
--- a/src/main/kotlin/model/ChartModels.kt
+++ b/src/main/kotlin/model/ChartModels.kt
@@ -38,6 +38,21 @@ cntg_vol : $cntg_vol
 acml_tr_pbmn : $acml_tr_pbmn
         """.trimIndent()
     }
+
+    /**
+     * 시가 대비 현재가 변동률(%)을 계산하여 반환합니다.
+     */
+    fun getFluctuationRate(): Double {
+        val openPrice = stck_oprc.toDoubleOrNull() ?: 0.0
+        val currentPrice = stck_prpr.toDoubleOrNull() ?: 0.0
+
+        // 시가가 0이거나 데이터가 없는 경우 0.0 반환 (0으로 나누기 방지)
+        if (openPrice == 0.0) return 0.0
+
+        // 변동률 계산 공식: ((현재가 - 시가) / 시가) * 100
+        return ((currentPrice - openPrice) / openPrice) * 100
+    }
+
 }
 @Serializable
 data class OverseasCandleData(
diff --git a/src/main/kotlin/service/AutoTradingManager.kt b/src/main/kotlin/service/AutoTradingManager.kt
index 2198789..f3a1c0b 100644
--- a/src/main/kotlin/service/AutoTradingManager.kt
+++ b/src/main/kotlin/service/AutoTradingManager.kt
@@ -968,7 +968,7 @@ object AutoTradingManager {
             }.filter {
                 val rate = it.prdy_ctrt.toDouble()
                 val corpInfo = DartCodeManager.getCorpCode(it.code)
-                val isOk = (rate > 0 && rate < KisSession.tradeConfig.plusFilter) || (rate < 0 && rate > (KisSession.tradeConfig.minusFilter * -1))
+                val isOk = (rate > 0 && rate < KisSession.tradeConfig.plusFilter) || (rate < 0 && rate > (abs(KisSession.tradeConfig.minusFilter) * -1))
 
                 if (corpInfo?.cName.isNullOrEmpty()) {
                     false