diff --git a/B06_Section/B06_Section_Section_Drafts.ts b/B06_Section/B06_Section_Section_Drafts.ts
index 5454d6385..1778426f0 100644
--- a/B06_Section/B06_Section_Section_Drafts.ts
+++ b/B06_Section/B06_Section_Section_Drafts.ts
@@ -160,10 +160,33 @@ export async function withDraftStations(
     if (inputs) {
       const [pipes, structures, types] = inputs;
       const planted = plantedChainages(pipes, structures, types);
+      // 구조물 측점에서 종류를 바꿈 = 「구조물 없는 상태」부터 새 종류로(요구 213) — 저장분 횡단은 빼 두고
+      // 새 자리처럼 미리 뜬 횡단을 씀 · 저장분 종류로 되돌리면 빼 둔 횡단이 돌아옴
+      const [oldPipes, oldStructures] = await savedOf(projectId).catch(
+        (): [Pipes, StructureInstance[]] => [[], []],
+      );
+      const byType = new Map(types.map((type) => [type.type_id, type]));
+      const kindsAt = (ps: Pipes, ss: StructureInstance[], at: number): string =>
+        [
+          ...ps
+            .filter((pipe) => pipeStationMarks(pipe).some((m) => near(m.chainage_m, at)))
+            .map((pipe) => `p:${pipe.facility ?? "pipe"}`),
+          ...ss
+            .filter((s) =>
+              structureStationMarks(s, byType.get(s.type_id)).some((m) => near(m.chainage_m, at)),
+            )
+            .map((s) => `s:${s.type_id}`),
+        ]
+          .sort()
+          .join(",");
+      const replaced = (section: CrossSection): boolean => {
+        const was = kindsAt(oldPipes, oldStructures, section.chainage_m);
+        return was !== "" && was !== kindsAt(pipes, structures, section.chainage_m);
+      };
       const isStale = (section: CrossSection): boolean =>
         section.kind === "irregular" &&
         !section.grid &&
-        planted.every((at) => !near(at, section.chainage_m));
+        (planted.every((at) => !near(at, section.chainage_m)) || replaced(section));
       stale = all.filter(isStale);
       live = all.filter((section) => !isStale(section));
       const missing = planted.filter(
diff --git a/resources/tester/helper_317_kind_change_station.cjs b/resources/tester/helper_317_kind_change_station.cjs
new file mode 100644
index 000000000..cb92ed9e5
--- /dev/null
+++ b/resources/tester/helper_317_kind_change_station.cjs
@@ -0,0 +1,79 @@
+/* PLAN 317 단위검증 헬퍼 — 구조물 측점에서 종류를 바꾸면 그 측점 횡단을 새로 뜬 것으로(저장분은 빼 둠).
+ * `withDraftStations` 를 Node 로 돌림 · 서버 부르는 모듈은 흉내 · 결과 = 표준출력 JSON 한 벌.
+ * 짝 = `test_317_kind_change_station.py`.
+ */
+const fs = require("fs");
+const path = require("path");
+const ts = require(path.join(__dirname, "..", "..", "config", "node_modules", "typescript"));
+
+const ROOT = path.join(__dirname, "..", "..");
+const state = { draftPipes: null, draftStructures: null, savedPipes: [], savedStructures: [] };
+const STUBS = {
+  "../B04_PreProcess/B04_PreProcess_Api_Fetch": {
+    fetchDetailPipePoints: async () => ({ pipe_points: state.savedPipes }),
+  },
+  "../B05_Profile/B05_Profile_Api_Structures": {
+    fetchStructures: async () => ({ structures: state.savedStructures }),
+    fetchStructureTypes: async () => [],
+    readPendingStructures: () => state.draftStructures,
+  },
+  "../B05_Profile/B05_Profile_Api_Pipes_Draft": { readPendingPipes: () => state.draftPipes },
+  "./B06_Section_Api_Fetch": {
+    previewStructureSections: async (_p, chainages) =>
+      chainages.map((at) => ({ chainage_m: at, kind: "irregular", design: { fresh: true } })),
+  },
+};
+const cache = new Map();
+const load = (file) => {
+  if (cache.has(file)) return cache.get(file);
+  const js = ts.transpileModule(fs.readFileSync(file, "utf8"), {
+    compilerOptions: { module: ts.ModuleKind.CommonJS, target: ts.ScriptTarget.ES2020 },
+  }).outputText;
+  const box = { exports: {} };
+  cache.set(file, box.exports);
+  const near = (m) => {
+    if (STUBS[m]) return STUBS[m];
+    if (m.startsWith("@util/")) return load(path.join(ROOT, "common_util", `${m.slice(6)}.ts`));
+    if (m.startsWith(".")) return load(path.join(path.dirname(file), `${m}.ts`));
+    return new Proxy({}, { get: () => () => {} });
+  };
+  new Function("exports", "module", "require", js)(box.exports, box, near);
+  return box.exports;
+};
+
+const { withDraftStations, forgetDraftStations } = load(
+  path.join(ROOT, "B06_Section", "B06_Section_Section_Drafts.ts"),
+);
+
+const detail = {
+  cross_sections: [
+    { chainage_m: 0, kind: "regular", design: { old: true } },
+    { chainage_m: 50, kind: "irregular", design: { old: true } },
+  ],
+};
+const at50 = () => detail.cross_sections.find((s) => Math.abs(s.chainage_m - 50) < 0.01);
+const snap = () => ({
+  count: detail.cross_sections.length,
+  fresh: Boolean(at50()?.design?.fresh),
+  old: Boolean(at50()?.design?.old),
+  preview: Boolean(at50()?.preview),
+});
+
+(async () => {
+  state.savedPipes = [{ chainage_m: 50, facility: "ford_pavement" }];
+  const out = {};
+  state.draftPipes = [{ chainage_m: 50, facility: "ford_pavement", options: { ford_width_m: 3 } }];
+  await withDraftStations(detail, "p1", 1);
+  out.same_kind = snap();
+  state.draftPipes = [{ chainage_m: 50, facility: "box_culvert" }];
+  await withDraftStations(detail, "p1", 1);
+  out.changed_kind = snap();
+  state.draftPipes = [{ chainage_m: 50, facility: "ford_pavement" }];
+  await withDraftStations(detail, "p1", 1);
+  out.back_to_saved = snap();
+  forgetDraftStations("p1");
+  process.stdout.write(JSON.stringify(out));
+})().catch((error) => {
+  process.stderr.write(String(error && error.stack ? error.stack : error));
+  process.exit(1);
+});
diff --git a/resources/tester/test_317_kind_change_station.py b/resources/tester/test_317_kind_change_station.py
new file mode 100644
index 000000000..c143904b7
--- /dev/null
+++ b/resources/tester/test_317_kind_change_station.py
@@ -0,0 +1,49 @@
+"""PLAN 317 — 구조물 측점에서 종류를 바꾸면 횡단을 「구조물 없는 상태」부터 새로(요구 213).
+
+- 저장분과 같은 종류 = 저장분 횡단 그대로
+- 다른 종류로 바꿈 = 저장분 횡단은 빼 두고 새 자리처럼 미리 뜬 횡단(옛 구조물 흔적 없음)
+- 저장분 종류로 되돌림 = 빼 둔 저장분 횡단이 돌아옴
+
+실제 TS(`withDraftStations`)를 `helper_317_kind_change_station.cjs` 가 Node 로 돌린다(서버 부르는 곳 흉내).
+"""
+
+from __future__ import annotations
+
+import json
+import os
+import subprocess
+
+import pytest
+
+HERE = os.path.dirname(__file__)
+ROOT = os.path.join(HERE, "..", "..")
+
+pytestmark = pytest.mark.skipif(
+    not os.path.isdir(os.path.join(ROOT, "config", "node_modules")),
+    reason="프론트엔드 의존성 미설치",
+)
+
+
+@pytest.fixture(scope="module")
+def result() -> dict:
+    out = subprocess.run(
+        ["node", os.path.join(HERE, "helper_317_kind_change_station.cjs")],
+        capture_output=True,
+        text=True,
+        encoding="utf-8",
+        timeout=120,
+        check=True,
+    )
+    return json.loads(out.stdout)
+
+
+def test_same_kind_keeps_saved_section(result: dict) -> None:
+    assert result["same_kind"] == {"count": 2, "fresh": False, "old": True, "preview": False}
+
+
+def test_changed_kind_starts_from_fresh_section(result: dict) -> None:
+    assert result["changed_kind"] == {"count": 2, "fresh": True, "old": False, "preview": True}
+
+
+def test_back_to_saved_kind_restores_saved_section(result: dict) -> None:
+    assert result["back_to_saved"] == {"count": 2, "fresh": False, "old": True, "preview": False}