diff --git a/README.zh-CN.md b/README.zh-CN.md
index d510bdf..32521dc 100644
--- a/README.zh-CN.md
+++ b/README.zh-CN.md
@@ -58,6 +58,7 @@ The first useful target is:
 - 已有 LinuxCNC RS274 源码级链接 smoke：本项目直接编译 23 个解释器 core 源文件，不再通过 `librs274` 取得解释器主体。
 - 已有五轴 RTCP 第一版几何内核，可根据编程刀尖点、A/B/C 姿态和刀长计算枢轴/主轴点补偿位置。
 - 已有坐标系事件回归语料，覆盖 `G10 L2`、`G10 L20` 的 G5X/XY 旋转事件和 `G92.1` 清零事件。
+- 已有探针事件回归语料，LinuxCNC `G38.3` 会输出独立 `probe` 事件，不再混作普通直线进给。
 - LinuxCNC Canon bridge 会把当前解释行号补到没有自带 `lineno` 的回调事件上，方便 Web 端诊断和源码高亮。
 - 下一步是继续替换源码级链接中残留的 Python、INI/HAL、文件系统和动态加载依赖，并把 RTCP 内核接入 canon 事件流和机型配置。
 
@@ -78,6 +79,7 @@ The first useful target is:
 - LinuxCNC RS274 源码级链接 smoke
 - 五轴 RTCP 几何内核 smoke
 - `G10 L2` / `G10 L20` / `G92.1` 坐标系事件回归
+- `G38.3` 探针事件回归
 
 ## 后端选择
 
diff --git a/core/src/canon_event_sink.cpp b/core/src/canon_event_sink.cpp
index 1da1f04..40ad5a3 100644
--- a/core/src/canon_event_sink.cpp
+++ b/core/src/canon_event_sink.cpp
@@ -156,6 +156,14 @@ void CanonEventSink::arc_feed(int line, const CncSimPose &end, const CncSimPose
     position_ = end;
 }
 
+void CanonEventSink::straight_probe(int line, const CncSimPose &end) {
+    CncSimEvent event = base_event(CNC_SIM_EVENT_PROBE, line);
+    event.start = position_;
+    event.end = end;
+    emit(event);
+    position_ = end;
+}
+
 void CanonEventSink::dwell(double seconds, int line) {
     CncSimEvent event = base_event(CNC_SIM_EVENT_DWELL, line);
     event.dwell_seconds = seconds;
diff --git a/core/src/canon_event_sink.h b/core/src/canon_event_sink.h
index ef205c9..659a777 100644
--- a/core/src/canon_event_sink.h
+++ b/core/src/canon_event_sink.h
@@ -27,6 +27,7 @@ public:
     void straight_traverse(int line, const CncSimPose &end);
     void straight_feed(int line, const CncSimPose &end);
     void arc_feed(int line, const CncSimPose &end, const CncSimPose &center, int turns);
+    void straight_probe(int line, const CncSimPose &end);
     void dwell(double seconds, int line);
     void program_end(int line);
     void emit_raw(CncSimEvent event);
diff --git a/core/src/linuxcnc_canon_bridge.cpp b/core/src/linuxcnc_canon_bridge.cpp
index 9cc0fbb..d730905 100644
--- a/core/src/linuxcnc_canon_bridge.cpp
+++ b/core/src/linuxcnc_canon_bridge.cpp
@@ -341,7 +341,7 @@ void STRAIGHT_PROBE(int lineno,
                     double u, double v, double w,
                     unsigned char) {
     if (active_sink) {
-        active_sink->straight_feed(lineno, make_pose(x, y, z, a, b, c, u, v, w));
+        active_sink->straight_probe(event_line(lineno), make_pose(x, y, z, a, b, c, u, v, w));
     }
 }
 
diff --git a/core/tests/cnc_sim_api_linuxcnc_rs274_smoke.cpp b/core/tests/cnc_sim_api_linuxcnc_rs274_smoke.cpp
index 31bb717..41c4165 100644
--- a/core/tests/cnc_sim_api_linuxcnc_rs274_smoke.cpp
+++ b/core/tests/cnc_sim_api_linuxcnc_rs274_smoke.cpp
@@ -71,6 +71,8 @@ int main() {
     bool saw_coordinate_end_line = false;
     bool saw_l20_g55_offset = false;
     bool saw_l20_end_line = false;
+    bool saw_probe = false;
+    bool saw_probe_as_feed = false;
     for (const auto &event : events) {
         saw_tool = saw_tool || event.type == CNC_SIM_EVENT_TOOL_CHANGE;
         saw_rapid = saw_rapid || event.type == CNC_SIM_EVENT_RAPID;
@@ -119,6 +121,29 @@ int main() {
     ok &= expect(saw_g49, "expected LinuxCNC G49 RTCP off state");
     ok &= expect(saw_g434, "expected LinuxCNC G43.4 RTCP on state with H code");
 
+    const char probe_program[] =
+        "G21 G90 G17\n"
+        "G0 X0 Y0 Z5\n"
+        "F100\n"
+        "G38.3 Z0\n"
+        "M30\n";
+    events.clear();
+    ok &= expect(cnc_sim_parse_program(sim, probe_program, sizeof(probe_program) - 1) == 0,
+                 cnc_sim_last_error(sim));
+    for (const auto &event : events) {
+        saw_probe = saw_probe ||
+                    (event.type == CNC_SIM_EVENT_PROBE &&
+                     event.line == 4 &&
+                     event.feed == 100.0 &&
+                     event.start.z == 5.0 &&
+                     event.end.z == 0.0);
+        saw_probe_as_feed = saw_probe_as_feed ||
+                            (event.type == CNC_SIM_EVENT_LINEAR_FEED &&
+                             event.line == 4);
+    }
+    ok &= expect(saw_probe, "expected LinuxCNC G38.3 probe event");
+    ok &= expect(!saw_probe_as_feed, "expected LinuxCNC G38.3 to avoid linear-feed event");
+
     const char l20_program[] =
         "G21 G90 G17\n"
         "G0 X5 Y6 Z7\n"
diff --git a/core/tests/linuxcnc_canon_bridge_smoke.cpp b/core/tests/linuxcnc_canon_bridge_smoke.cpp
index c2ad052..aceede8 100644
--- a/core/tests/linuxcnc_canon_bridge_smoke.cpp
+++ b/core/tests/linuxcnc_canon_bridge_smoke.cpp
@@ -39,6 +39,7 @@ int main() {
     STRAIGHT_TRAVERSE(10, 0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0);
     STRAIGHT_FEED(11, 10.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0);
     ARC_FEED(12, 10.0, 10.0, 10.0, 5.0, 1, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0);
+    STRAIGHT_PROBE(13, 10.0, 10.0, -1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0);
     SET_G5X_OFFSET(1, 10.0, 20.0, 30.0, 1.0, 2.0, 3.0, 0.0, 0.0, 0.0);
     SET_G92_OFFSET(1.0, 2.0, 3.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0);
     SET_XY_ROTATION(15.0);
@@ -53,6 +54,7 @@ int main() {
     bool saw_rapid = false;
     bool saw_feed = false;
     bool saw_arc = false;
+    bool saw_probe = false;
     bool saw_g5x = false;
     bool saw_g92 = false;
     bool saw_rotation = false;
@@ -65,6 +67,11 @@ int main() {
                               event.end.y == 10.0 &&
                               event.center.x == 10.0 &&
                               event.center.y == 5.0);
+        saw_probe = saw_probe || (event.type == CNC_SIM_EVENT_PROBE &&
+                                  event.line == 13 &&
+                                  event.start.x == 10.0 &&
+                                  event.start.y == 10.0 &&
+                                  event.end.z == -1.0);
         saw_g5x = saw_g5x || (event.type == CNC_SIM_EVENT_SET_G5X_OFFSET &&
                               event.tool == 1 &&
                               event.start.x == 10.0 &&
@@ -86,6 +93,7 @@ int main() {
     ok &= expect(saw_rapid, "expected rapid move");
     ok &= expect(saw_feed, "expected linear feed");
     ok &= expect(saw_arc, "expected arc feed");
+    ok &= expect(saw_probe, "expected probe event");
     ok &= expect(saw_g5x, "expected G5X offset event");
     ok &= expect(saw_g92, "expected G92 offset event");
     ok &= expect(saw_rotation, "expected XY rotation event");
diff --git a/test-linuxcnc-rs274-native.sh b/test-linuxcnc-rs274-native.sh
index ce2df3c..d97a65c 100755
--- a/test-linuxcnc-rs274-native.sh
+++ b/test-linuxcnc-rs274-native.sh
@@ -38,6 +38,7 @@ CNC_SIM_RS274_VAR="$var_file" "$build_dir/linuxcnc_rs274_dump" tests/gcode/linux
 CNC_SIM_RS274_VAR="$var_file" "$build_dir/linuxcnc_rs274_dump" tests/gcode/basic_mill.ngc >/tmp/cnc_sim_linuxcnc_basic_mill.json
 CNC_SIM_RS274_VAR="$var_file" "$build_dir/linuxcnc_rs274_dump" tests/gcode/linuxcnc_rtcp_controls.ngc >/tmp/cnc_sim_linuxcnc_rtcp_controls.json
 CNC_SIM_RS274_VAR="$var_file" "$build_dir/linuxcnc_rs274_dump" tests/gcode/linuxcnc_canned_cycle.ngc >/tmp/cnc_sim_linuxcnc_canned_cycle.json
+CNC_SIM_RS274_VAR="$var_file" "$build_dir/linuxcnc_rs274_dump" tests/gcode/linuxcnc_probe_no_error.ngc >/tmp/cnc_sim_linuxcnc_probe_no_error.json
 cp "$base_var_file" "$var_file"
 CNC_SIM_RS274_VAR="$var_file" "$build_dir/linuxcnc_rs274_dump" tests/gcode/linuxcnc_coordinate_offsets.ngc >/tmp/cnc_sim_linuxcnc_coordinate_offsets.json
 cp "$base_var_file" "$var_file"
@@ -82,6 +83,19 @@ actual_cycle = [(event["type"], event["end"]["x"], event["end"]["y"], event["end
 if actual_cycle != expected_cycle:
     raise SystemExit(f"unexpected G81/G80 expansion: {actual_cycle!r}")
 
+probe = json.loads(Path("/tmp/cnc_sim_linuxcnc_probe_no_error.json").read_text())
+if not any(
+    event["type"] == "probe" and
+    event["line"] == 4 and
+    event["feed"] == 100 and
+    event["start"]["z"] == 5 and
+    event["end"]["z"] == 0
+    for event in probe
+):
+    raise SystemExit("missing G38.3 probe event")
+if any(event["type"] == "linear-feed" and event["line"] == 4 for event in probe):
+    raise SystemExit("G38.3 probe should not be emitted as linear-feed")
+
 coords = json.loads(Path("/tmp/cnc_sim_linuxcnc_coordinate_offsets.json").read_text())
 g5x = [event for event in coords if event["type"] == "set-g5x-offset"]
 g92 = [event for event in coords if event["type"] == "set-g92-offset"]
@@ -128,5 +142,6 @@ echo "dumped /tmp/cnc_sim_linuxcnc_basic_motion.json"
 echo "dumped /tmp/cnc_sim_linuxcnc_basic_mill.json"
 echo "dumped /tmp/cnc_sim_linuxcnc_rtcp_controls.json"
 echo "dumped /tmp/cnc_sim_linuxcnc_canned_cycle.json"
+echo "dumped /tmp/cnc_sim_linuxcnc_probe_no_error.json"
 echo "dumped /tmp/cnc_sim_linuxcnc_coordinate_offsets.json"
 echo "dumped /tmp/cnc_sim_linuxcnc_coordinate_l20.json"
diff --git a/tests/gcode/linuxcnc_probe_no_error.ngc b/tests/gcode/linuxcnc_probe_no_error.ngc
new file mode 100644
index 0000000..83d8476
--- /dev/null
+++ b/tests/gcode/linuxcnc_probe_no_error.ngc
@@ -0,0 +1,5 @@
+G21 G90 G17
+G0 X0 Y0 Z5
+F100
+G38.3 Z0
+M30