diff --git a/Cargo.lock b/Cargo.lock
index 846f2c4..4c3a172 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -292,7 +292,7 @@ checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
 
 [[package]]
 name = "mindustry_logic_bang_lang"
-version = "0.14.14"
+version = "0.14.15"
 dependencies = [
  "display_source",
  "parser",
@@ -337,7 +337,7 @@ dependencies = [
 
 [[package]]
 name = "parser"
-version = "0.2.1"
+version = "0.3.0"
 dependencies = [
  "lalrpop",
  "lalrpop-util",
@@ -348,7 +348,7 @@ dependencies = [
 
 [[package]]
 name = "parser-tests"
-version = "0.1.8"
+version = "0.1.9"
 dependencies = [
  "parser",
  "syntax",
diff --git a/Cargo.toml b/Cargo.toml
index e0b38f8..024b51d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "mindustry_logic_bang_lang"
-version = "0.14.14"
+version = "0.14.15"
 edition = "2021"
 
 authors = ["A4-Tacks <wdsjxhno1001@163.com>"]
diff --git a/examples/op_expr.mdtlbl b/examples/op_expr.mdtlbl
index dec83a6..2d6a7f3 100644
--- a/examples/op_expr.mdtlbl
+++ b/examples/op_expr.mdtlbl
@@ -22,17 +22,20 @@
 * | `a & b`    | `a & b`      | -6     | LR     |
 * | `a ^ b`    | `a ^ b`      | -7     | LR     |
 * | `a | b`    | `a | b`      | -8     | LR     |
-* | `a == b`   | `a == b`     | -9     | LR     |
-* | `a != b`   | `a != b`     | -9     | LR     |
-* | `a < b`    | `a < b`      | -9     | LR     |
-* | `a > b`    | `a > b`      | -9     | LR     |
-* | `a <= b`   | `a <= b`     | -9     | LR     |
-* | `a >= b`   | `a >= b`     | -9     | LR     |
-* | `a === b`  | `a === b`    | -9     | LR     |
-* | `a !== b`  | `a !== b`    | -9     | LR     |
-* | `a && b`   | `a && b`     | -10    | LR     |
-* | `a || b`   | `a + b`      | -11    | LR     |
-* | `if c?a:b` | ...          | -12    | LR     |
+* | `a < b`    | `a < b`      | -9     | -      |
+* | `a > b`    | `a > b`      | -9     | -      |
+* | `a <= b`   | `a <= b`     | -9     | -      |
+* | `a >= b`   | `a >= b`     | -9     | -      |
+* | `a == b`   | `a == b`     | -10    | -      |
+* | `a != b`   | `a != b`     | -10    | -      |
+* | `a === b`  | `a === b`    | -10    | -      |
+* | `a !== b`  | `a !== b`    | -10    | -      |
+* | `a && b`   | `a && b`     | -11    | LR     |
+* | `a || b`   | `a + b`      | -12    | LR     |
+* | `if c?a:b` | ...          | -13    | LR     |
+*
+* 结合性的`LR`指左结合 比如`a+b+c`结合为`(a+b)+c`
+* 而结合性为`-`指不发生结合, 将需要添加括号
 *
 * 以上表格外, 还有一元与二元函数(其实就是op)
 * 它们的优先级与括号平级,
diff --git a/tools/parser/Cargo.toml b/tools/parser/Cargo.toml
index 39147a8..849d9cf 100644
--- a/tools/parser/Cargo.toml
+++ b/tools/parser/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "parser"
-version = "0.2.1"
+version = "0.3.0"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
diff --git a/tools/parser/src/parser.lalrpop b/tools/parser/src/parser.lalrpop
index cc6fa31..ff417ae 100644
--- a/tools/parser/src/parser.lalrpop
+++ b/tools/parser/src/parser.lalrpop
@@ -457,43 +457,35 @@ OpExprDoMultiple: (Vec<Value>, Vec<OpExprInfo>) = {
     },
 }
 
-OpExprBody: OpExprInfo = OpExprBody12;
+OpExprBody: OpExprInfo = OpExprBody13;
 
-OpExprBody12: OpExprInfo = {
-    "if" <cmp:JumpCmp> "?" <a:OpExprBody12> ":" <b:OpExprBody12> => {
+OpExprBody13: OpExprInfo = {
+    "if" <cmp:JumpCmp> "?" <a:OpExprBody13> ":" <b:OpExprBody13> => {
         OpExprInfo::new_if_else(meta, cmp, a, b)
     },
-    OpExprBody11,
+    OpExprBody12,
 }
 
-OpExprBody11: OpExprInfo = {
-    <a:OpExprBody11> "||" <b:OpExprBody10> => op_expr_build_op(
+OpExprBody12: OpExprInfo = {
+    <a:OpExprBody12> "||" <b:OpExprBody11> => op_expr_build_op(
         || Op::Add(ResultHandle, a.into_value(meta), b.into_value(meta))),
-    OpExprBody10,
+    OpExprBody11,
 }
 
-OpExprBody10: OpExprInfo = {
-    <a:OpExprBody10> "&&" <b:OpExprBody9> => op_expr_build_op(
+OpExprBody11: OpExprInfo = {
+    <a:OpExprBody11> "&&" <b:OpExprBody10> => op_expr_build_op(
         || Op::Land(ResultHandle, a.into_value(meta), b.into_value(meta))),
-    OpExprBody9,
+    OpExprBody10,
 }
 
-OpExprBody9: OpExprInfo = {
-    <a:OpExprBody9> "==" <b:OpExprBody8> => op_expr_build_op(
+OpExprBody10: OpExprInfo = {
+    <a:OpExprBody9> "==" <b:OpExprBody9> => op_expr_build_op(
         || Op::Equal(ResultHandle, a.into_value(meta), b.into_value(meta))),
-    <a:OpExprBody9> "!=" <b:OpExprBody8> => op_expr_build_op(
+    <a:OpExprBody9> "!=" <b:OpExprBody9> => op_expr_build_op(
         || Op::NotEqual(ResultHandle, a.into_value(meta), b.into_value(meta))),
-    <a:OpExprBody9> "<" <b:OpExprBody8> => op_expr_build_op(
-        || Op::LessThan(ResultHandle, a.into_value(meta), b.into_value(meta))),
-    <a:OpExprBody9> ">" <b:OpExprBody8> => op_expr_build_op(
-        || Op::GreaterThan(ResultHandle, a.into_value(meta), b.into_value(meta))),
-    <a:OpExprBody9> "<=" <b:OpExprBody8> => op_expr_build_op(
-        || Op::LessThanEq(ResultHandle, a.into_value(meta), b.into_value(meta))),
-    <a:OpExprBody9> ">=" <b:OpExprBody8> => op_expr_build_op(
-        || Op::GreaterThanEq(ResultHandle, a.into_value(meta), b.into_value(meta))),
-    <a:OpExprBody9> "===" <b:OpExprBody8> => op_expr_build_op(
+    <a:OpExprBody9> "===" <b:OpExprBody9> => op_expr_build_op(
         || Op::StrictEqual(ResultHandle, a.into_value(meta), b.into_value(meta))),
-    <a:OpExprBody9> "!==" <b:OpExprBody8> =>
+    <a:OpExprBody9> "!==" <b:OpExprBody9> =>
         op_expr_build_op(|| Op::Equal(
             ResultHandle,
             DExp::new_nores(vec![
@@ -501,6 +493,17 @@ OpExprBody9: OpExprInfo = {
             ].into()).into(),
             ReprVar(FALSE_VAR.into())
         )),
+    OpExprBody9,
+}
+OpExprBody9: OpExprInfo = {
+    <a:OpExprBody8> "<" <b:OpExprBody8> => op_expr_build_op(
+        || Op::LessThan(ResultHandle, a.into_value(meta), b.into_value(meta))),
+    <a:OpExprBody8> ">" <b:OpExprBody8> => op_expr_build_op(
+        || Op::GreaterThan(ResultHandle, a.into_value(meta), b.into_value(meta))),
+    <a:OpExprBody8> "<=" <b:OpExprBody8> => op_expr_build_op(
+        || Op::LessThanEq(ResultHandle, a.into_value(meta), b.into_value(meta))),
+    <a:OpExprBody8> ">=" <b:OpExprBody8> => op_expr_build_op(
+        || Op::GreaterThanEq(ResultHandle, a.into_value(meta), b.into_value(meta))),
     OpExprBody8,
 }
 
diff --git a/tools/parser/tests/Cargo.toml b/tools/parser/tests/Cargo.toml
index 2d2b9fa..405adc6 100644
--- a/tools/parser/tests/Cargo.toml
+++ b/tools/parser/tests/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "parser-tests"
-version = "0.1.8"
+version = "0.1.9"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
diff --git a/tools/parser/tests/src/lib.rs b/tools/parser/tests/src/lib.rs
index 9c63d57..c18a4e8 100644
--- a/tools/parser/tests/src/lib.rs
+++ b/tools/parser/tests/src/lib.rs
@@ -2229,6 +2229,47 @@ fn op_expr_test() {
         "#).unwrap(),
     );
 
+    assert_eq!(
+        parse!(parser, r#"
+        x = a < b == c > d;
+        x = a < b != c > d;
+        x = a < b === c > d;
+        x = a < b !== c > d;
+        "#).unwrap(),
+        parse!(parser, r#"
+        op x (op $ a < b;) == (op $ c > d;);
+        op x (op $ a < b;) != (op $ c > d;);
+        op x (op $ a < b;) === (op $ c > d;);
+        op x (op $ a < b;) !== (op $ c > d;);
+        "#).unwrap(),
+    );
+
+    assert!(
+        parse!(parser, r#"
+        x = a == b == c;
+        "#).is_err(),
+    );
+
+    assert!(
+        parse!(parser, r#"
+        x = a < b < c;
+        "#).is_err(),
+    );
+
+    assert!(
+        parse!(parser, r#"
+        x = a === b === c;
+        "#).is_err(),
+    );
+
+    assert_eq!(
+        parse!(parser, r#"
+        x = (a < b) < c;
+        "#).unwrap(),
+        parse!(parser, r#"
+        op x (op $ a < b;) < c;
+        "#).unwrap(),
+    );
 }
 
 #[test]