diff --git a/crates/oxide_vm/src/dispatch/comparison.rs b/crates/oxide_vm/src/dispatch/comparison.rs
index 915ffde8..76dc2d61 100644
--- a/crates/oxide_vm/src/dispatch/comparison.rs
+++ b/crates/oxide_vm/src/dispatch/comparison.rs
@@ -29,8 +29,8 @@ impl Vm {
         vm_trace!("LT rd={} r{}={:?} r{}={:?}", rd, a, self.regs[a], b, self.regs[b]);
         let va = self.coerce_primitive_bounded(self.regs[a], false)?;
         let vb = self.coerce_primitive_bounded(self.regs[b], false)?;
-        if (va.is_bigint() || vb.is_bigint()) && (va.is_symbol() || vb.is_symbol()) {
-            return self.raise_type_error("Cannot mix BigInt and other types, use explicit conversions");
+        if va.is_symbol() || vb.is_symbol() {
+            return self.raise_type_error("Cannot convert a Symbol value to a number");
         }
         match coercion::relational_compare(va, vb) {
             Some(r) => self.regs[rd] = JsValue::bool(r),
@@ -47,8 +47,8 @@ impl Vm {
         vm_trace!("GT rd={} r{}={:?} r{}={:?}", rd, a, self.regs[a], b, self.regs[b]);
         let va = self.coerce_primitive_bounded(self.regs[a], false)?;
         let vb = self.coerce_primitive_bounded(self.regs[b], false)?;
-        if (va.is_bigint() || vb.is_bigint()) && (va.is_symbol() || vb.is_symbol()) {
-            return self.raise_type_error("Cannot mix BigInt and other types, use explicit conversions");
+        if va.is_symbol() || vb.is_symbol() {
+            return self.raise_type_error("Cannot convert a Symbol value to a number");
         }
         match coercion::relational_compare(vb, va) {
             Some(r) => self.regs[rd] = JsValue::bool(r),
@@ -65,8 +65,8 @@ impl Vm {
         vm_trace!("LTE rd={} r{}={:?} r{}={:?}", rd, a, self.regs[a], b, self.regs[b]);
         let va = self.coerce_primitive_bounded(self.regs[a], false)?;
         let vb = self.coerce_primitive_bounded(self.regs[b], false)?;
-        if (va.is_bigint() || vb.is_bigint()) && (va.is_symbol() || vb.is_symbol()) {
-            return self.raise_type_error("Cannot mix BigInt and other types, use explicit conversions");
+        if va.is_symbol() || vb.is_symbol() {
+            return self.raise_type_error("Cannot convert a Symbol value to a number");
         }
         match coercion::relational_compare(vb, va) {
             Some(r) => self.regs[rd] = JsValue::bool(!r),
@@ -83,8 +83,8 @@ impl Vm {
         vm_trace!("GTE rd={} r{}={:?} r{}={:?}", rd, a, self.regs[a], b, self.regs[b]);
         let va = self.coerce_primitive_bounded(self.regs[a], false)?;
         let vb = self.coerce_primitive_bounded(self.regs[b], false)?;
-        if (va.is_bigint() || vb.is_bigint()) && (va.is_symbol() || vb.is_symbol()) {
-            return self.raise_type_error("Cannot mix BigInt and other types, use explicit conversions");
+        if va.is_symbol() || vb.is_symbol() {
+            return self.raise_type_error("Cannot convert a Symbol value to a number");
         }
         match coercion::relational_compare(va, vb) {
             Some(r) => self.regs[rd] = JsValue::bool(!r),
diff --git a/crates/oxide_vm/tests/comparison_tests.rs b/crates/oxide_vm/tests/comparison_tests.rs
index 5fdd1b05..de561658 100644
--- a/crates/oxide_vm/tests/comparison_tests.rs
+++ b/crates/oxide_vm/tests/comparison_tests.rs
@@ -157,3 +157,27 @@ fn eval_string_relational_utf16_code_unit_order() {
         assert_eq!(eval(source), expected, "source: {source}");
     }
 }
+
+#[test]
+fn eval_relational_symbol_throws() {
+    // 关系比较任一侧为 Symbol 时按 ToNumber 抛 TypeError（规范 13.7.5 步骤 4/5）。
+    assert_eq!(
+        eval("Object(Symbol()) <= ''"),
+        "vm error: uncaught TypeError: Cannot convert a Symbol value to a number"
+    );
+    // symbol 与 bigint 混合时 symbol 消息优先（ToNumber 先于混合判定）。
+    assert_eq!(
+        eval("Object(Symbol()) < 1n"),
+        "vm error: uncaught TypeError: Cannot convert a Symbol value to a number"
+    );
+    assert_eq!(
+        eval("Object(Symbol()) > 1n"),
+        "vm error: uncaught TypeError: Cannot convert a Symbol value to a number"
+    );
+    assert_eq!(
+        eval("1n >= Object(Symbol())"),
+        "vm error: uncaught TypeError: Cannot convert a Symbol value to a number"
+    );
+    // 松散等值对 symbol 不抛，返回 false（回归钉）。
+    assert_eq!(eval("Object(Symbol()) == 'Symbol()'"), "false");
+}