diff --git a/backend/src/main/java/com/goldenchart/service/BacktestingService.java b/backend/src/main/java/com/goldenchart/service/BacktestingService.java
index acc511e..fe34790 100644
--- a/backend/src/main/java/com/goldenchart/service/BacktestingService.java
+++ b/backend/src/main/java/com/goldenchart/service/BacktestingService.java
@@ -88,6 +88,14 @@ public class BacktestingService {
         }
         // 요청에 포함된 파라미터가 있으면 DB 값 위에 덮어씀 (요청값 우선)
         Map<String, Map<String, Object>> params = mergeIndicatorParams(dbParams, req.getIndicatorParams());
+        log.info("[Backtest] 인디케이터 파라미터 로드 — deviceId={}, dbParams키={}, reqParams키={}, 최종키={}",
+                req.getDeviceId(),
+                dbParams.keySet(),
+                req.getIndicatorParams() != null ? req.getIndicatorParams().keySet() : "null",
+                params.keySet());
+        if (params.containsKey("Stochastic")) {
+            log.info("[Backtest] Stochastic 파라미터: {}", params.get("Stochastic"));
+        }
         if (params.isEmpty()) {
             log.warn("[Backtest] 인디케이터 파라미터 없음 — deviceId={}, 지표 기본값 사용 가능성 있음", req.getDeviceId());
         }
@@ -153,6 +161,8 @@ public class BacktestingService {
         // positionMode: LONG_ONLY(기본) | SIGNAL_ONLY(포지션 락 우회)
         String         posMode     = cfg.getPositionMode() != null ? cfg.getPositionMode() : "LONG_ONLY";
         boolean        signalOnly  = "SIGNAL_ONLY".equals(posMode);
+        log.info("[Backtest] 실행 시작 — strategyId={}, bars={}, timeframe={}, positionMode={}, signalOnly={}",
+                req.getStrategyId(), series.getBarCount(), req.getTimeframe(), posMode, signalOnly);
 
         double  initCap       = cfg.getInitialCapital()  != null ? cfg.getInitialCapital().doubleValue()  : 10_000_000.0;
         double  tradeSizePct  = cfg.getTradeSizeValue()  != null ? cfg.getTradeSizeValue().doubleValue() / 100.0 : 1.0;
@@ -175,15 +185,19 @@ public class BacktestingService {
 
             // ── SIGNAL_ONLY 모드: 포지션·자금 상태 무관, 조건 충족 시마다 전체 시그널 생성 ──
             if (signalOnly) {
-                if (entryRule.isSatisfied(i)) {
+                boolean entrySatisfied = entryRule.isSatisfied(i);
+                boolean exitSatisfied  = exitRule.isSatisfied(i);
+                if (entrySatisfied) {
                     double effEntry = applySlippage(closePrice, cfg, true);
                     String buyType  = "SHORT".equals(direction) ? "SHORT_ENTRY" : "BUY";
                     signals.add(buildFillSignal(time, buyType, effEntry, i, 1.0));
+                    log.debug("[Backtest:SIGNAL_ONLY] BUY @ bar={} price={}", i, effEntry);
                 }
-                if (exitRule.isSatisfied(i)) {
+                if (exitSatisfied) {
                     double effExit = applySlippage(exitPrice, cfg, false);
                     String sellType = "SHORT".equals(direction) ? "SHORT_EXIT" : "SELL";
                     signals.add(buildFillSignal(time, sellType, effExit, i, 1.0));
+                    log.debug("[Backtest:SIGNAL_ONLY] SELL @ bar={} price={}", i, effExit);
                 }
                 continue;
             }
@@ -248,6 +262,11 @@ public class BacktestingService {
             if (useLedger) ledger.markToMarket(closePrice);
         }
 
+        long buyCnt  = signals.stream().filter(s -> "BUY".equals(s.type()) || "SHORT_ENTRY".equals(s.type())).count();
+        long sellCnt = signals.stream().filter(s -> "SELL".equals(s.type()) || "SHORT_EXIT".equals(s.type())).count();
+        log.info("[Backtest] 완료 — strategyId={}, bars={}, 생성시그널={}개 (매수={}, 매도={}), positionMode={}",
+                req.getStrategyId(), barCount, signals.size(), buyCnt, sellCnt, posMode);
+
         double lastMarkPrice = barCount > 0
                 ? series.getBar(barCount - 1).getClosePrice().doubleValue() : 0.0;
         double finalEquity = resolveFinalEquity(ledger, useLedger, cfg, initCap, equity, inPosition,