diff --git a/src/components/xtFlowEditor.vue b/src/components/xtFlowEditor.vue
index 115ffe28..90c93998 100644
--- a/src/components/xtFlowEditor.vue
+++ b/src/components/xtFlowEditor.vue
@@ -61,6 +61,8 @@
 					:default-viewport="{ zoom: 0.9 }"
 					:min-zoom="0.2"
 					:max-zoom="2"
+					:connection-radius="8"
+					:connect-on-click="false"
 					:nodes-draggable="true"
 					:nodes-connectable="!readonly"
 					:elements-selectable="true"
@@ -87,13 +89,14 @@
 			</div>
 		</div>
 
-		<!-- 复用现有单步表单：新增/编辑一条 Route；key 随每次打开递增，强制重建实例杜绝上次内容残留 -->
+		<!-- 复用现有单步表单：新增/编辑一条 Route；key 随每次打开递增强制重建实例，预填走 prop 在挂载时即确定 -->
 		<route-form
 			v-if="dialogVisible"
 			:key="dialogSeq"
 			ref="routeForm"
 			:count="count"
 			:routepack="routepack"
+			:prefill="formPrefill"
 			@success="onFormSuccess"
 			@closed="dialogVisible = false"
 		></route-form>
@@ -143,6 +146,7 @@ export default {
 			count: 0,
 			dialogVisible: false,
 			dialogSeq: 0,
+			formPrefill: null,
 			// 左侧物料面板
 			matType: "30",
 			matKeyword: "",
@@ -153,6 +157,7 @@ export default {
 			// 连线手势内部状态
 			connectSource: null,
 			connectMade: false,
+			connectStartPos: null,
 			// 仅初次加载自动适配一次，避免编辑时视图跳动
 			hasFitted: false,
 		};
@@ -284,9 +289,12 @@ export default {
 			if (pid) routeNodeIds.add(pid);
 			this.seedNodes = this.seedNodes.filter((s) => !routeNodeIds.has(s.id));
 
+			const prevCount = this.nodes.length;
 			this.edges = edges;
 			this.nodes = layoutGraph(routeNodes.concat(this.seedNodes), edges);
 			this.syncStore();
+			// 节点增减后 dagre 会整体重排，重新适配视野，避免“看着是空白其实有节点”导致拉线误吸附
+			if (this.hasFitted && this.nodes.length !== prevCount) this.doFit();
 		},
 
 		/** 把本地 nodes/edges 命令式同步到 Vue Flow store（先节点后边，避免边找不到端点） */
@@ -376,11 +384,18 @@ export default {
 		onConnectStart(params) {
 			this.connectSource = (params && (params.nodeId || params.source)) || null;
 			this.connectMade = false;
+			const oe = params && params.event;
+			this.connectStartPos = oe && oe.clientX != null ? { x: oe.clientX, y: oe.clientY } : null;
 		},
 		/** 连到已有节点：新建一条 Route，预填输入/输出物料 */
 		onConnect(conn) {
 			this.connectMade = true;
 			if (this.readonly) return;
+			// 误吸附保护：吸回起点自身或目标无效时，按“拉到空白”处理，只带输入
+			if (!conn.target || conn.target === conn.source) {
+				this.openAddFrom(conn.source);
+				return;
+			}
 			const src = this.nodes.find((n) => n.id === conn.source);
 			const tgt = this.nodes.find((n) => n.id === conn.target);
 			// 注意：id 为雪花大整数，必须保持字符串，切勿 Number() 否则精度丢失
@@ -392,16 +407,28 @@ export default {
 			});
 		},
 		/** 拉线到空白处：新建工序，输出物料留空由后端自动生成下一节点 */
-		onConnectEnd() {
+		onConnectEnd(evt) {
 			const src = this.connectSource;
 			const made = this.connectMade;
+			const startPos = this.connectStartPos;
 			this.connectSource = null;
 			this.connectMade = false;
+			this.connectStartPos = null;
 			if (this.readonly || made || !src) return;
-			const node = this.nodes.find((n) => n.id === src);
+			// 单纯点击手柄(几乎无位移)不算拉线，不弹新增表单
+			const oe = evt && evt.clientX != null ? evt : evt && evt.event;
+			if (startPos && oe && oe.clientX != null) {
+				const dist = Math.hypot(oe.clientX - startPos.x, oe.clientY - startPos.y);
+				if (dist < 8) return;
+			}
+			this.openAddFrom(src);
+		},
+		/** 以某节点为输入新建工序：只带输入物料，其余字段一律默认值 */
+		openAddFrom(srcId) {
+			const node = this.nodes.find((n) => n.id === srcId);
 			// id 为雪花大整数，保持字符串
 			this.openForm("add", {
-				material_in: src,
+				material_in: srcId,
 				material_in_name: node ? node.data.label : "",
 			});
 		},
@@ -479,13 +506,13 @@ export default {
 			this.openForm("add", null);
 		},
 
-		/** 打开单步表单；prefill 为 null 表示纯新增 */
+		/** 打开单步表单；prefill 为 null 表示纯新增。预填经 prop 传入，在表单挂载 open 时一次性应用 */
 		openForm(mode, prefill) {
 			this.dialogSeq += 1;
+			this.formPrefill = prefill || null;
 			this.dialogVisible = true;
 			this.$nextTick(() => {
-				const inst = this.$refs.routeForm.open(mode);
-				if (prefill) inst.setData(prefill);
+				this.$refs.routeForm.open(mode);
 			});
 		},
 
diff --git a/src/views/mtm/route_form.vue b/src/views/mtm/route_form.vue
index 5d192144..aefbcd5d 100644
--- a/src/views/mtm/route_form.vue
+++ b/src/views/mtm/route_form.vue
@@ -305,6 +305,8 @@ export default {
 	props: {
 		count: { type: Number, default : 0 },
 		routepack: { type: String, default: "" },
+		// 打开时的预填数据(画布拉线传入)：挂载即确定，避免事后setData在任何时序下带入脏数据
+		prefill: { type: Object, default: null },
 	},
 	emits: ["success", "closed"],
 	data() {
@@ -503,6 +505,7 @@ export default {
 			let that = this;
 			that.mode = mode;
 			that.resetForm();
+			if (that.prefill) that.setData(that.prefill);
 			that.visible = true;
 			that.$nextTick(() => {
 				// 仅新增时按现有数量预填排序；编辑时保留 setData 带入的原 sort