diff --git a/app/terminal/model/dishes/Foods.php b/app/terminal/model/dishes/Foods.php
index 3cc1b96..d1eb8bd 100644
--- a/app/terminal/model/dishes/Foods.php
+++ b/app/terminal/model/dishes/Foods.php
@@ -11,9 +11,22 @@ namespace app\terminal\model\dishes;
 use app\common\model\dishes\Foods as FoodsModel;
 use app\common\enum\dishes\FoodsStatus as FoodsStatusEnum;
 use app\common\enum\dishes\GasFood as GasFoodEnum;
+use app\common\service\FixedScaleDecimalResponse;

 class Foods extends FoodsModel
 {
+    /** Preserve MySQL DECIMAL(10,2) JSON strings without changing raw model values. */
+    public function toArray(): array
+    {
+        return FixedScaleDecimalResponse::fields(parent::toArray(), [
+            'energy', 'carbohydrate', 'protein', 'fat', 'sfa', 'mufa', 'pufa', 'cholesterol',
+            'va', 'renieratene', 'retinol', 'vb1', 'vb2', 'vpp', 'vc', 've', 'folic_acid',
+            'biotin', 'pantothenic_acid', 'choline', 'potassium', 'sodium', 'calcium',
+            'magnesium', 'iron', 'zinc', 'selenium', 'iodine', 'phosphorus', 'cuprum',
+            'manganese', 'purine', 'dietary_fiber', 'moisture', 'ash', 'gi', 'gl',
+        ]);
+    }
+
     /**
      * 列表
      * @param array $param
@@ -113,4 +126,4 @@ class Foods extends FoodsModel
         $createData = $this->createData($data);
         return $this->save($createData);
     }
-}
\ No newline at end of file
+}

diff --git a/app/terminal/model/dishes/Dishes.php b/app/terminal/model/dishes/Dishes.php
index 2082a52..adf9b4f 100644
--- a/app/terminal/model/dishes/Dishes.php
+++ b/app/terminal/model/dishes/Dishes.php
@@ -11,9 +11,34 @@ namespace app\terminal\model\dishes;
 use app\common\model\dishes\Dishes as DishesModel;
 use app\common\enum\dishes\MealTimes as MealTimesEnum;
 use app\common\enum\dishes\RawFlag as RawFlagEnum;
+use app\common\service\FixedScaleDecimalResponse;

 class Dishes extends DishesModel
 {
+    /** Normalize only observed DECIMAL response projections, including recipe pivots. */
+    public function toArray(): array
+    {
+        $row = FixedScaleDecimalResponse::fields(parent::toArray(), [
+            'weight', 'raw_flag_weight',
+            'energy', 'carbohydrate', 'protein', 'fat', 'sfa', 'mufa', 'pufa', 'cholesterol',
+            'va', 'renieratene', 'retinol', 'vb1', 'vb2', 'vpp', 'vc', 've', 'folic_acid',
+            'biotin', 'pantothenic_acid', 'choline', 'potassium', 'sodium', 'calcium',
+            'magnesium', 'iron', 'zinc', 'selenium', 'iodine', 'phosphorus', 'cuprum',
+            'manganese', 'purine', 'dietary_fiber', 'moisture', 'ash', 'gi', 'gl',
+        ]);
+        if (isset($row['foods']) && is_array($row['foods'])) {
+            foreach ($row['foods'] as &$food) {
+                if (isset($food['pivot']) && is_array($food['pivot'])) {
+                    $food['pivot'] = FixedScaleDecimalResponse::fields($food['pivot'], [
+                        'foods_weight', 'foods_ratio',
+                    ]);
+                }
+            }
+            unset($food);
+        }
+        return $row;
+    }
+
     /**
      * 列表
      * @param array $param
@@ -151,4 +176,4 @@ class Dishes extends DishesModel
         //todo
         return true;
     }
-}
\ No newline at end of file
+}

diff --git a/tests/TerminalCatalogDecimalResponseContractTest.php b/tests/TerminalCatalogDecimalResponseContractTest.php
new file mode 100644
--- /dev/null
+++ b/tests/TerminalCatalogDecimalResponseContractTest.php
@@ -0,0 +1,63 @@
+<?php
+declare(strict_types=1);
+
+// Optional private overlay allows red/green without editing the working repository.
+$repo = getenv('TERMINAL_TEST_REPO') ?: dirname(__DIR__);
+$loader = require $repo . '/vendor/autoload.php';
+if ($overlay = getenv('TERMINAL_SOURCE_OVERLAY')) {
+    $loader->setPsr4('app\\', $overlay . '/app');
+    $loader->setPsr4('cores\\', $overlay . '/cores');
+}
+if (!function_exists('app_name')) { function app_name(): string { return 'terminal'; } }
+if (!function_exists('getStoreId')) { function getStoreId(): int { return 10001; } }
+
+$assertions = 0;
+$assert = static function ($actual, $expected, string $message) use (&$assertions): void {
+    ++$assertions;
+    if ($actual !== $expected) throw new RuntimeException($message);
+};
+$nutrition = [
+    'energy','carbohydrate','protein','fat','sfa','mufa','pufa','cholesterol',
+    'va','renieratene','retinol','vb1','vb2','vpp','vc','ve','folic_acid',
+    'biotin','pantothenic_acid','choline','potassium','sodium','calcium',
+    'magnesium','iron','zinc','selenium','iodine','phosphorus','cuprum',
+    'manganese','purine','dietary_fiber','moisture','ash','gi','gl',
+];
+foreach ([\app\terminal\model\dishes\Foods::class => $nutrition,
+    \app\terminal\model\dishes\Dishes::class => array_merge(['weight','raw_flag_weight'], $nutrition)] as $class => $fields) {
+    foreach ([[1.25,'1.25'],[0,'0.00'],[-1.25,'-1.25'],[null,null],
+        ['12.50','12.50'],['99999999.99','99999999.99'],
+        ['9007199254740993.01','9007199254740993.01']] as [$raw,$expected]) {
+        $data = array_fill_keys($fields, $raw) + ['id'=>9007199254740993,
+            'category'=>3,'is_delete'=>0,'float_probe'=>1.2345,'name'=>'test'];
+        $model = new $class($data);
+        $row = $model->toArray();
+        foreach ($fields as $field) {
+            $assert($row[$field], $expected, $class . ' ' . $field . ' serialized DECIMAL type/value');
+            $assert($model[$field], $raw, $class . ' ' . $field . ' must not mutate raw model data');
+        }
+        $assert($row['id'], 9007199254740993, 'Identifier must remain exact integer');
+        $assert($row['category'], 3, 'Integer category must not stringify');
+        $assert($row['float_probe'], 1.2345, 'Non-whitelisted float must not change');
+        $assert(json_decode(json_encode($model), true)['energy'], $expected, 'JSON must use the same DECIMAL contract');
+    }
+    $empty = new $class(['id'=>1]);
+    $assert(array_key_exists('energy', $empty->toArray()), false, 'Do not synthesize absent columns');
+}
+
+$dish = new \app\terminal\model\dishes\Dishes(['id'=>1,'weight'=>12.5]);
+$food = new \app\terminal\model\dishes\Foods(['id'=>2,'name'=>'fixture','energy'=>3.5]);
+$pivot = new \think\model\Pivot(['dishes_id'=>1,'foods_id'=>2,
+    'foods_weight'=>2.5,'foods_ratio'=>0,'ssb'=>1.2345]);
+$food->setRelation('pivot', $pivot);
+$dish->setRelation('foods', new \think\model\Collection([$food]));
+$row = $dish->toArray();
+$assert($row['foods'][0]['pivot']['foods_weight'], '2.50', 'Nested foods_weight must retain two-place string');
+$assert($row['foods'][0]['pivot']['foods_ratio'], '0.00', 'Nested foods_ratio must retain two-place string');
+$assert($row['foods'][0]['pivot']['foods_id'], 2, 'Nested pivot ID must not stringify');
+$assert($row['foods'][0]['pivot']['ssb'], 1.2345, 'Unobserved pivot fields remain unchanged');
+$assert($pivot['foods_weight'], 2.5, 'Nested raw pivot must not mutate');
+$pivot->setAttr('foods_weight', null);
+$assert($dish->toArray()['foods'][0]['pivot']['foods_weight'], null, 'Nested null must remain null');
+
+echo 'TERMINAL_CATALOG_DECIMAL_CONTRACT_PASS assertions=' . $assertions . "\n";