diff --git a/server-rs/crates/platform-tripo/src/common/extra.rs b/server-rs/crates/platform-tripo/src/common/extra.rs
new file mode 100644
index 000000000..14ef2d2cd
--- /dev/null
+++ b/server-rs/crates/platform-tripo/src/common/extra.rs
@@ -0,0 +1,31 @@
+//! provider 请求的 SDK `extra` 字段构造。
+//!
+//! `texture_version` 与 `delight` 不在 SDK params 的具名参数里，只能按 SDK 期望的
+//! 键名透传。键名一旦在某个入口写错，请求体就会静默丢字段，所以三个生成入口共用
+//! 同一份构造逻辑，不在各 endpoint 里各写一遍。
+
+use std::collections::HashMap;
+
+use serde_json::Value;
+use shared_contracts::model3d::common::Model3dTextureVersion;
+
+const EXTRA_TEXTURE_VERSION: &str = "texture_version";
+const EXTRA_DELIGHT: &str = "delight";
+
+/// 按 provider 需要的键名构造 `extra`；未提供的参数不写入，由 provider 取默认值。
+pub(crate) fn extra_fields(
+    texture_version: Option<Model3dTextureVersion>,
+    delight: Option<bool>,
+) -> HashMap<String, Value> {
+    let mut extra = HashMap::new();
+    if let Some(value) = texture_version {
+        extra.insert(
+            EXTRA_TEXTURE_VERSION.into(),
+            Value::String(value.as_str().into()),
+        );
+    }
+    if let Some(value) = delight {
+        extra.insert(EXTRA_DELIGHT.into(), Value::Bool(value));
+    }
+    extra
+}
diff --git a/server-rs/crates/platform-tripo/src/common/mod.rs b/server-rs/crates/platform-tripo/src/common/mod.rs
index f5ad1094d..5529bb3da 100644
--- a/server-rs/crates/platform-tripo/src/common/mod.rs
+++ b/server-rs/crates/platform-tripo/src/common/mod.rs
@@ -1,6 +1,7 @@
 mod client;
 mod config;
 mod error;
+mod extra;
 mod mapping;
 mod types;
 mod validation;
@@ -8,6 +9,7 @@ mod validation;
 pub use client::TripoProviderClient;
 pub use config::TripoSettings;
 pub use error::{TripoError, TripoField, TripoValidationReason};
+pub(crate) use extra::extra_fields;
 pub(crate) use mapping::map_task;
 pub use types::{
     TripoDownloadedArtifact, TripoTaskFailure, TripoTaskHandle, TripoTaskOutput, TripoTaskSnapshot,
diff --git a/server-rs/crates/platform-tripo/src/image_to_model/client.rs b/server-rs/crates/platform-tripo/src/image_to_model/client.rs
index c9ae60941..0c17d84bb 100644
--- a/server-rs/crates/platform-tripo/src/image_to_model/client.rs
+++ b/server-rs/crates/platform-tripo/src/image_to_model/client.rs
@@ -1,12 +1,13 @@
 use shared_contracts::model3d::common::{
     Model3dCompression, Model3dExportOrientation, Model3dGeometryQuality, Model3dInputOrientation,
-    Model3dTextureAlignment, Model3dTextureQuality, Model3dTextureVersion,
+    Model3dTextureAlignment, Model3dTextureQuality,
 };
 use shared_contracts::model3d::image_to_model::Model3dImageToModelParams;
 use tripo3d_sdk::{models::FileInput, params::ImageToModelParams};
 
 use crate::common::{
     TripoError, TripoField, TripoProviderClient, TripoTaskHandle, TripoValidationReason,
+    extra_fields,
 };
 
 use super::validation::validate_image_to_model_params;
@@ -150,20 +151,3 @@ fn to_sdk_params(input: FileInput, params: &Model3dImageToModelParams) -> ImageT
         style: None,
     }
 }
-
-fn extra_fields(
-    texture_version: Option<Model3dTextureVersion>,
-    delight: Option<bool>,
-) -> std::collections::HashMap<String, serde_json::Value> {
-    let mut extra = std::collections::HashMap::new();
-    if let Some(value) = texture_version {
-        extra.insert(
-            "texture_version".into(),
-            serde_json::Value::String(value.as_str().into()),
-        );
-    }
-    if let Some(value) = delight {
-        extra.insert("delight".into(), serde_json::Value::Bool(value));
-    }
-    extra
-}
diff --git a/server-rs/crates/platform-tripo/src/multiview_to_model/client.rs b/server-rs/crates/platform-tripo/src/multiview_to_model/client.rs
index c69c0cd73..1117b5653 100644
--- a/server-rs/crates/platform-tripo/src/multiview_to_model/client.rs
+++ b/server-rs/crates/platform-tripo/src/multiview_to_model/client.rs
@@ -9,7 +9,7 @@ use tripo3d_sdk::{models::FileInput, params::MultiviewToModelParams};
 
 use crate::common::{
     TripoError, TripoField, TripoGenerationOptions, TripoProviderClient, TripoTaskHandle,
-    TripoValidationReason, validate_generation_options, validate_task_id,
+    TripoValidationReason, extra_fields, validate_generation_options, validate_task_id,
 };
 
 impl TripoProviderClient {
@@ -106,17 +106,7 @@ fn to_sdk_params(request: &Model3dMultiviewToModelRequest) -> MultiviewToModelPa
         .texture_quality
         .map(Model3dTextureQuality::as_str)
         .map(str::to_owned);
-    if let Some(value) = request.texture_version {
-        params.extra.insert(
-            "texture_version".into(),
-            serde_json::Value::String(value.as_str().into()),
-        );
-    }
-    if let Some(value) = request.delight {
-        params
-            .extra
-            .insert("delight".into(), serde_json::Value::Bool(value));
-    }
+    params.extra = extra_fields(request.texture_version, request.delight);
     params.geometry_quality = request
         .geometry_quality
         .map(Model3dGeometryQuality::as_str)
diff --git a/server-rs/crates/platform-tripo/src/text_to_model/client.rs b/server-rs/crates/platform-tripo/src/text_to_model/client.rs
index e253faa22..fa11c5755 100644
--- a/server-rs/crates/platform-tripo/src/text_to_model/client.rs
+++ b/server-rs/crates/platform-tripo/src/text_to_model/client.rs
@@ -1,7 +1,6 @@
-use crate::common::{TripoError, TripoProviderClient, TripoTaskHandle};
+use crate::common::{TripoError, TripoProviderClient, TripoTaskHandle, extra_fields};
 use shared_contracts::model3d::common::{
     Model3dCompression, Model3dExportOrientation, Model3dGeometryQuality, Model3dTextureQuality,
-    Model3dTextureVersion,
 };
 use shared_contracts::model3d::text_to_model::Model3dTextToModelParams;
 
@@ -58,20 +57,3 @@ fn to_sdk_params(params: &Model3dTextToModelParams) -> tripo3d_sdk::params::Text
         style: None,
     }
 }
-
-fn extra_fields(
-    texture_version: Option<Model3dTextureVersion>,
-    delight: Option<bool>,
-) -> std::collections::HashMap<String, serde_json::Value> {
-    let mut extra = std::collections::HashMap::new();
-    if let Some(value) = texture_version {
-        extra.insert(
-            "texture_version".into(),
-            serde_json::Value::String(value.as_str().into()),
-        );
-    }
-    if let Some(value) = delight {
-        extra.insert("delight".into(), serde_json::Value::Bool(value));
-    }
-    extra
-}