diff --git a/docs/src/change_log/dr_game.md b/docs/src/change_log/dr_game.md
index 4a469a6..cf65888 100644
--- a/docs/src/change_log/dr_game.md
+++ b/docs/src/change_log/dr_game.md
@@ -3,7 +3,19 @@
 
 - 最新版本号
   - DR game: 0.3.2.0
-  - DR rs: 0.2.20.1
+  - DR rs: 0.2.20.2
+
+## 20230724 DR rs 0.2.20.2
+
+### Fix
+
+- [#49](https://github.com/shenjackyuanjie/Difficult-Rocket/issues/49)
+  - missing field `touchingGround`
+  - SR1 says: `touchingGround` field is NOT Required
+    - make them happy
+    - SR1 说: `touchingGround` 字段也是可选的
+      - 让他们开心
+      - 我就看看我能发多少个 issue
 
 ## 20230724 DR rs 0.2.20.1
 
diff --git a/mods/dr_game/Difficult_Rocket_rs/src/src/lib.rs b/mods/dr_game/Difficult_Rocket_rs/src/src/lib.rs
index eb1f723..352bd0f 100644
--- a/mods/dr_game/Difficult_Rocket_rs/src/src/lib.rs
+++ b/mods/dr_game/Difficult_Rocket_rs/src/src/lib.rs
@@ -24,7 +24,7 @@ enum LoadState {
 }
 
 #[pyfunction]
-fn get_version_str() -> String { "0.2.20.1".to_string() }
+fn get_version_str() -> String { "0.2.20.2".to_string() }
 
 #[pyfunction]
 fn test_call(py_obj: &PyAny) -> PyResult<bool> {
diff --git a/mods/dr_game/Difficult_Rocket_rs/src/src/sr1_data.rs b/mods/dr_game/Difficult_Rocket_rs/src/src/sr1_data.rs
index d83e18e..5ffdcb2 100644
--- a/mods/dr_game/Difficult_Rocket_rs/src/src/sr1_data.rs
+++ b/mods/dr_game/Difficult_Rocket_rs/src/src/sr1_data.rs
@@ -377,7 +377,7 @@ pub mod ship {
 
     use super::part_list::SR1PartTypeEnum;
 
-    use crate::types::sr1::{i8_to_bool, SR1PartDataTrait, SR1PartTypeAttr, SR1ShipTrait};
+    use crate::types::sr1::{i8_to_bool, option_i8_to_option_bool, SR1PartDataTrait, SR1PartTypeAttr, SR1ShipTrait};
     use crate::types::sr1::{IdType, SR1PartData, SR1PartDataAttr, SR1Ship};
 
     #[derive(Debug, Serialize, Deserialize, Clone)]
@@ -393,7 +393,9 @@ pub mod ship {
         #[serde(rename = "liftedOff")]
         pub lift_off: i8,
         #[serde(rename = "touchingGround")]
-        pub touch_ground: i8,
+        pub touch_ground: Option<i8>, // Option for https://github.com/shenjackyuanjie/Difficult-Rocket/issues/49
+        // SR1 says it's optional, let them happy
+        // NOT always 0
         #[serde(rename = "DisconnectedParts")]
         pub disconnected: Option<DisconnectedParts>,
     }
@@ -577,7 +579,7 @@ pub mod ship {
                 parts,
                 connections,
                 lift_off: i8_to_bool(self.lift_off.to_owned()),
-                touch_ground: i8_to_bool(self.touch_ground.to_owned()),
+                touch_ground: option_i8_to_option_bool(self.touch_ground.to_owned()).unwrap_or(true),
                 disconnected,
             }
         }
diff --git a/mods/dr_game/Difficult_Rocket_rs/src/src/types.rs b/mods/dr_game/Difficult_Rocket_rs/src/src/types.rs
index 1c8f3ac..77b33e2 100644
--- a/mods/dr_game/Difficult_Rocket_rs/src/src/types.rs
+++ b/mods/dr_game/Difficult_Rocket_rs/src/src/types.rs
@@ -979,7 +979,7 @@ pub mod sr1 {
                 connects: connections,
                 version: Some(self.version),
                 lift_off: bool_to_i8(self.lift_off),
-                touch_ground: bool_to_i8(self.touch_ground),
+                touch_ground: Some(bool_to_i8(self.touch_ground)),
                 disconnected,
             }
         }
diff --git a/mods/dr_game/__init__.py b/mods/dr_game/__init__.py
index 51223df..17a82e5 100644
--- a/mods/dr_game/__init__.py
+++ b/mods/dr_game/__init__.py
@@ -16,7 +16,7 @@ from Difficult_Rocket.api.mod import ModInfo
 from Difficult_Rocket.client import ClientWindow
 from Difficult_Rocket.api.types import Options, Version
 
-DR_rust_version = Version("0.2.20.1")  # DR_mod 的 Rust 编写部分的兼容版本
+DR_rust_version = Version("0.2.20.2")  # DR_mod 的 Rust 编写部分的兼容版本
 
 logger = logging.getLogger('client.dr_game')