diff --git a/application/execution_service.py b/application/execution_service.py
index 30cac3b..b1cfc1b 100644
--- a/application/execution_service.py
+++ b/application/execution_service.py
@@ -253,6 +253,7 @@ class ExecutionCycleResult:
 
 DEFAULT_SAFE_HAVEN_CASH_SUBSTITUTE_THRESHOLD_USD = 1000.0
 SMALL_ACCOUNT_SAFE_HAVEN_CASH_SUBSTITUTE_LIMIT_USD = 2000.0
+SMALL_ACCOUNT_EXISTING_WHOLE_SHARE_RETENTION_SYMBOLS = frozenset({"TQQQ", "SOXL"})
 
 
 def _noop_sleep(_seconds):
@@ -520,12 +521,30 @@ def _apply_small_account_whole_share_compatibility(
             continue
         if price > 0.0:
             quote_prices[symbol] = price
+    retained_symbols = []
+    portfolio = dict((plan or {}).get("portfolio") or {})
+    quantities = {
+        str(symbol or "").strip().upper(): float(quantity or 0.0)
+        for symbol, quantity in dict(portfolio.get("quantities") or {}).items()
+    }
+    compatibility_targets = {
+        str(symbol or "").strip().upper(): float(value or 0.0)
+        for symbol, value in target_values.items()
+    }
+    for symbol in candidate_symbols:
+        if symbol not in SMALL_ACCOUNT_EXISTING_WHOLE_SHARE_RETENTION_SYMBOLS:
+            continue
+        target_value = max(0.0, float(compatibility_targets.get(symbol, 0.0) or 0.0))
+        price = max(0.0, float(quote_prices.get(symbol, 0.0) or 0.0))
+        if price > 0.0 and 0.0 < target_value < price and quantities.get(symbol, 0.0) >= 1.0:
+            compatibility_targets[symbol] = price
+            retained_symbols.append(symbol)
     safe_haven_symbols = _safe_haven_cash_symbols(
-        portfolio=dict((plan or {}).get("portfolio") or {}),
+        portfolio=portfolio,
         allocation=allocation,
     )
     compatibility = apply_small_account_cash_compatibility(
-        target_values,
+        compatibility_targets,
         quote_prices,
         candidate_symbols=candidate_symbols,
         safe_haven_cash_symbols=safe_haven_symbols,
@@ -554,10 +573,14 @@ def _apply_small_account_whole_share_compatibility(
         adjusted_allocation["small_account_whole_share_substituted_symbols"] = substituted
     if safe_haven_substituted:
         adjusted_allocation["small_account_safe_haven_cash_substituted_symbols"] = tuple(safe_haven_substituted)
+    if retained_symbols:
+        adjusted_allocation["small_account_existing_whole_share_retained_symbols"] = tuple(
+            dict.fromkeys(retained_symbols)
+        )
     if cash_substitution_notes:
         adjusted_allocation["small_account_whole_share_cash_notes"] = cash_substitution_notes
     adjusted_plan = dict(plan or {})
-    if substituted or safe_haven_substituted:
+    if substituted or safe_haven_substituted or retained_symbols:
         adjusted_plan["allocation"] = adjusted_allocation
     return adjusted_plan, adjusted_allocation
 
diff --git a/tests/test_rebalance_service.py b/tests/test_rebalance_service.py
index 315e152..2eeab63 100644
--- a/tests/test_rebalance_service.py
+++ b/tests/test_rebalance_service.py
@@ -1355,6 +1355,75 @@ def test_tqqq_delevered_qqqm_target_is_executable_for_small_account(self):
         self.assertIn("限价买入] QQQM: 1股", sent_messages[0])
         self.assertNotIn("QQQM.US 目标金额 $507.87 低于 1 股价格", sent_messages[0])
 
+    def test_existing_tqqq_retention_below_one_share_keeps_min_whole_share(self):
+        plan = _build_plan(
+            strategy_profile="tqqq_growth_income",
+            strategy_symbols=("TQQQ", "QQQM", "BOXX", "SCHD", "DGRO", "SGOV", "SPYI", "QQQI"),
+            risk_symbols=("TQQQ", "QQQM"),
+            income_symbols=("SCHD", "DGRO", "SGOV", "SPYI", "QQQI"),
+            safe_haven_symbols=("BOXX",),
+            targets={
+                "TQQQ": 60.94,
+                "QQQM": 320.00,
+                "BOXX": 0.0,
+                "SCHD": 0.0,
+                "DGRO": 0.0,
+                "SGOV": 0.0,
+                "SPYI": 0.0,
+                "QQQI": 0.0,
+            },
+            market_values={
+                "TQQQ": 541.31,
+                "QQQM": 0.0,
+                "BOXX": 0.0,
+                "SCHD": 0.0,
+                "DGRO": 0.0,
+                "SGOV": 0.0,
+                "SPYI": 0.0,
+                "QQQI": 0.0,
+            },
+            sellable_quantities={"TQQQ": 7, "QQQM": 0, "BOXX": 0, "SCHD": 0, "DGRO": 0, "SGOV": 0, "SPYI": 0, "QQQI": 0},
+            quantities={"TQQQ": 7, "QQQM": 0, "BOXX": 0, "SCHD": 0, "DGRO": 0, "SGOV": 0, "SPYI": 0, "QQQI": 0},
+            current_min_trade=100.0,
+            trade_threshold_value=100.0,
+            investable_cash=528.91,
+            market_status="",
+            deploy_ratio_text="",
+            income_ratio_text="",
+            income_locked_ratio_text="",
+            signal_message="🚀 入场信号",
+            available_cash=539.70,
+            total_strategy_equity=539.70,
+            portfolio_rows=(("TQQQ", "QQQM", "BOXX"), ("SCHD", "DGRO", "SGOV", "SPYI", "QQQI")),
+            benchmark_symbol="QQQ",
+            benchmark_price=722.05,
+            long_trend_value=626.87,
+            exit_line=626.87,
+        )
+
+        sent_messages, _, _ = self._run_strategy(
+            plan,
+            prices={
+                "TQQQ.US": 77.33,
+                "QQQM.US": 297.19,
+                "BOXX.US": 116.95,
+                "SCHD.US": 80.0,
+                "DGRO.US": 65.0,
+                "SGOV.US": 100.0,
+                "SPYI.US": 52.0,
+                "QQQI.US": 52.0,
+            },
+            estimate_max_purchase_quantity_value=10,
+            strategy_display_name="TQQQ 增长收益",
+        )
+
+        self.assertEqual(len(sent_messages), 1)
+        self.assertIn("🔔 【调仓指令】", sent_messages[0])
+        self.assertIn("限价卖出] TQQQ: 6股 @ $76.94", sent_messages[0])
+        self.assertNotIn("限价卖出] TQQQ: 7股", sent_messages[0])
+        self.assertIn("限价买入] QQQM: 1股 @ $298.68", sent_messages[0])
+        self.assertNotIn("TQQQ.US 目标金额 $60.94 低于 1 股价格", sent_messages[0])
+
     def test_target_gap_below_one_share_does_not_report_cash_shortage(self):
         plan = _build_plan(
             strategy_symbols=("SOXL", "SOXX", "BOXX", "QQQI", "SPYI"),