diff --git a/ui/src/conversation-panel/components/message-input/user-form/index.vue b/ui/src/conversation-panel/components/message-input/user-form/index.vue
index 5832586373f..cbe28aa4413 100644
--- a/ui/src/conversation-panel/components/message-input/user-form/index.vue
+++ b/ui/src/conversation-panel/components/message-input/user-form/index.vue
@@ -230,8 +230,8 @@ onBeforeUnmount(() => {
       />
 
       <!-- 打开更多参数 -->
-      <el-button v-if="showMoreButton" ref="moreButtonRef" class="size-8! min-w-0! px-0!" @click="popoverVisible = !popoverVisible">
-        <MkIcon name="icon_setting" :size="16" />
+      <el-button plain v-if="showMoreButton" ref="moreButtonRef" class="w-8! min-w-8!" @click="popoverVisible = !popoverVisible">
+        <MkIcon name="icon_card_outlined" />
       </el-button>
 
       <el-popover
@@ -241,26 +241,27 @@ onBeforeUnmount(() => {
         virtual-triggering
         trigger="manual"
         placement="top-start"
-        :width="400"
-        :popper-style="{ padding: '16px 8px' }"
+        :width="420"
         @show="userForm.saveSnapshot"
       >
-        <div class="mb-4 truncate break-all font-medium" :title="menuTitle">{{ menuTitle }}</div>
-        <el-scrollbar max-height="450px">
-          <MkDynamicsForm :key="`popover-${formRefreshKey}`" ref="popoverFormRef" v-model="formData" :render-data="popoverFields" />
-          <MkDynamicsForm
-            v-if="apiInputEditable"
-            :key="`api-${formRefreshKey}`"
-            ref="apiFormRef"
-            v-model="apiFormData"
-            :render-data="apiInputFields"
-          />
-        </el-scrollbar>
-        <div class="mt-2 text-right">
-          <!-- 取消修改 -->
-          <el-button @click="cancelHandle">取消</el-button>
-          <!-- 确认参数 -->
-          <el-button type="primary" @click="confirmHandle">确认</el-button>
+        <div class="p-4">
+          <h4 class="mb-4 truncate break-all" :title="menuTitle">{{ menuTitle }}</h4>
+          <el-scrollbar max-height="360px" class="-mr-4" view-class="pr-4">
+            <MkDynamicsForm :key="`popover-${formRefreshKey}`" ref="popoverFormRef" v-model="formData" :render-data="popoverFields" />
+            <MkDynamicsForm
+              v-if="apiInputEditable"
+              :key="`api-${formRefreshKey}`"
+              ref="apiFormRef"
+              v-model="apiFormData"
+              :render-data="apiInputFields"
+            />
+          </el-scrollbar>
+          <div class="mt-4">
+            <!-- 确认参数 -->
+            <el-button type="primary" @click="confirmHandle">确认</el-button>
+            <!-- 取消修改 -->
+            <el-button plain @click="cancelHandle">取消</el-button>
+          </div>
         </div>
       </el-popover>
     </template>
@@ -271,7 +272,7 @@ onBeforeUnmount(() => {
 /* 行内开关与下拉框同高同边框（主题将开关高度改为 22px），标签固定为常规文字色，不随开关状态高亮。 */
 :deep(.mk-conversation-user-form__switch) {
   box-sizing: border-box;
-  height: var(--el-component-size);
+  height: 32px;
   justify-content: space-between;
   padding: 0 12px;
   border: 1px solid var(--el-border-color);
@@ -281,7 +282,7 @@ onBeforeUnmount(() => {
     min-width: 0;
     max-width: 56px;
     margin-right: 8px;
-    color: var(--el-text-color-regular);
+    color: var(--mk-N900);
 
     span {
       display: block;
diff --git a/ui/src/workflow-canvas/WORKFLOW_README.md b/ui/src/workflow-canvas/WORKFLOW_README.md
index 4aeb7b8c72c..1673286a0b1 100644
--- a/ui/src/workflow-canvas/WORKFLOW_README.md
+++ b/ui/src/workflow-canvas/WORKFLOW_README.md
@@ -540,6 +540,8 @@ MkFormList 的排序、增删均以 `cloneDeep` 回写；MkTable 保留普通行
 
 当前用于应用工作流及循环体，根据用户需求规划、创建节点、连线与配置字段。
 页面通过 WorkflowCanvas.getLogicFlow() 提供画布，生成结果只改图，不自动保存。
+模型选择支持参数设置，不提供添加模型入口；优先沿用默认 LLM 的参数，切换模型加载对应默认参数。
+首轮生成时固定模型及参数，父 agent 和委派的子 agent 共用，并通过 `model_params_setting` 传入补全请求；新建会话后可重新配置。
 
 | 位置            | 职责                                                     |
 | --------------- | -------------------------------------------------------- |
diff --git a/ui/src/workflow-canvas/ai-generate/common.ts b/ui/src/workflow-canvas/ai-generate/common.ts
index a018f412197..4d2c1f4e2c5 100644
--- a/ui/src/workflow-canvas/ai-generate/common.ts
+++ b/ui/src/workflow-canvas/ai-generate/common.ts
@@ -31,6 +31,7 @@ export function useAgentConfig(config: AgentConfig, bindings: AgentBindings): Ru
     messages,
     tools: config.tools,
     modelId: bindings.modelId,
+    modelParams: bindings.modelParams,
     resourceScope: bindings.resourceScope,
     call: bindings.call,
     position: bindings.position ?? [],
diff --git a/ui/src/workflow-canvas/ai-generate/create-agent.ts b/ui/src/workflow-canvas/ai-generate/create-agent.ts
index c1266c1b251..3ce384f6d9c 100644
--- a/ui/src/workflow-canvas/ai-generate/create-agent.ts
+++ b/ui/src/workflow-canvas/ai-generate/create-agent.ts
@@ -42,7 +42,7 @@ function toExecutor(value: unknown): Executor {
  * 某工具返回 AgentSuccessResult / AgentErrorResult 结束、被停止或超过轮次。工具返回 ErrorResult 或抛错时把错误回喂模型自愈。
  */
 export function createAgent(agent: RunnableAgent): AgentHandle {
-  const { tools, modelId, resourceScope, call, position, maxIterations } = agent
+  const { tools, modelId, modelParams, resourceScope, call, position, maxIterations } = agent
   const controller = new AbortController()
   const stopCallbacks: Array<() => void> = []
   const messages: AgentMessage[] = agent.messages
@@ -72,7 +72,7 @@ export function createAgent(agent: RunnableAgent): AgentHandle {
         if (controller.signal.aborted) return finish({ status: 'stopped' })
         if (iteration > maxIterations) return finish({ status: 'error', data: `超过最大轮次 ${maxIterations}` })
 
-        const response = await runTurn(resourceScope, modelId, messages, tools, emit, controller.signal)
+        const response = await runTurn(resourceScope, modelId, modelParams, messages, tools, emit, controller.signal)
         const toolCalls = response.toolCalls ?? []
         const assistantMessage: AgentMessage = { role: 'assistant', content: response.content || '' }
         // thinking 模型要求思考内容按原字段名回传，否则下一轮请求会被拒绝
@@ -124,6 +124,7 @@ export function createAgent(agent: RunnableAgent): AgentHandle {
 function runTurn(
   resourceScope: string,
   modelId: string,
+  modelParams: Record<string, unknown> | undefined,
   messages: AgentMessage[],
   tools: AgentTool[],
   emit: (payload: AgentPayload) => void,
@@ -154,7 +155,7 @@ function runTurn(
         else reject(new Error('本轮结束但未收到完整结果'))
       },
     }
-    chatCompletion(resourceScope, modelId, { messages, tools: toToolSchemas(tools) }, sink, signal)
+    chatCompletion(resourceScope, modelId, { messages, tools: toToolSchemas(tools), model_params_setting: modelParams }, sink, signal)
   })
 }
 
diff --git a/ui/src/workflow-canvas/ai-generate/panel/AiGeneratePanel.vue b/ui/src/workflow-canvas/ai-generate/panel/AiGeneratePanel.vue
index ee31d083b9a..5315ae9f833 100644
--- a/ui/src/workflow-canvas/ai-generate/panel/AiGeneratePanel.vue
+++ b/ui/src/workflow-canvas/ai-generate/panel/AiGeneratePanel.vue
@@ -1,6 +1,7 @@
 <script setup lang="ts">
 import { computed, inject, nextTick, onBeforeUnmount, ref, useTemplateRef } from 'vue'
 import { useRoute } from 'vue-router'
+import { cloneDeep } from 'lodash'
 import type LogicFlow from '@logicflow/core'
 import type { ScrollbarInstance } from 'element-plus'
 import type { DefaultModelSettingPayload, ModelItem, ModelProviderItem } from '@/api/types'
@@ -38,6 +39,7 @@ const visible = ref(false)
 const status = ref<GenerateStatus>('idle')
 const requirement = ref('')
 const modelId = ref('')
+const modelParams = ref<Record<string, unknown>>({})
 const modelOptions = ref<ModelItem[]>([])
 const providerOptions = ref<ModelProviderItem[]>([])
 const scrollbarRef = useTemplateRef<ScrollbarInstance>('scrollbarRef')
@@ -55,6 +57,7 @@ function loadModels() {
       if (!modelId.value) {
         const defaultModelId = props.defaultModelSettings?.LLM?.model_id
         modelId.value = models.find((model) => model.id === defaultModelId)?.id ?? models[0]?.id ?? ''
+        modelParams.value = modelId.value === defaultModelId ? cloneDeep(props.defaultModelSettings?.LLM?.model_params_setting ?? {}) : {}
       }
     })
     .catch(() => MsgError('获取模型列表失败'))
@@ -89,6 +92,7 @@ async function run(text: string) {
       useApplicationAgent({
         rootLf: lf,
         modelId: modelId.value,
+        modelParams: cloneDeep(modelParams.value),
         call: { onNext: onEvent },
         workflowMode: props.workflowMode,
         resourceScope,
@@ -200,6 +204,9 @@ defineExpose({ open, close })
           <SelectModel
             class="w-50!"
             v-model="modelId"
+            v-model:model-params="modelParams"
+            can-edit-params
+            :can-add="false"
             :options="modelOptions"
             :provider-options="providerOptions"
             :disabled="started"
diff --git a/ui/src/workflow-canvas/ai-generate/type.ts b/ui/src/workflow-canvas/ai-generate/type.ts
index 8dd5784a859..c6470109898 100644
--- a/ui/src/workflow-canvas/ai-generate/type.ts
+++ b/ui/src/workflow-canvas/ai-generate/type.ts
@@ -104,6 +104,8 @@ export interface AgentBindings {
   rootLf: LogicFlow
   /** 模型 id（委派的子 agent 复用同一模型） */
   modelId: string
+  /** 生成及委派补全共用的模型参数 */
+  modelParams?: Record<string, unknown>
   /** 对外事件出口 */
   call: Call<AgentEvent>
   /** 主画布模式 */
@@ -134,6 +136,8 @@ export interface RunnableAgent {
   messages: AgentMessage[]
   tools: AgentTool[]
   modelId: string
+  /** 生成及委派补全共用的模型参数 */
+  modelParams?: Record<string, unknown>
   /** 画布资源范围，补全请求经 useWorkflowStore(resourceScope) 发起 */
   resourceScope: string
   call: Call<AgentEvent>