diff --git a/database/seeders/MaterielSeeder.php b/database/seeders/MaterielSeeder.php
index cbe9f79..13abbb5 100644
--- a/database/seeders/MaterielSeeder.php
+++ b/database/seeders/MaterielSeeder.php
@@ -25,15 +25,13 @@ class MaterielSeeder extends Seeder
         foreach ([2020, 2021, 2022] as $year) {
             foreach ([1, 2, 3, 4] as $quarter) {
                 foreach (['豆粕', '花生饼', '麦麸', '菜籽饼', '糠饼', '鱼粉'] as $name) {
-                    $random = mt_rand(50, 100);
-
                     $values[] = [
                         'name' => $name,
                         'type' => MaterielType::Fodder,
                         'year' => $year,
                         'quarter' => $quarter,
-                        'lowest_price' => $random,
-                        'highest_price' => mt_rand($random + 10, $random + 100),
+                        'lowest_price' => 0,
+                        'highest_price' => mt_rand(10, 150),
                         'created_by' => $admin->id,
                         'updated_by' => $admin->id,
                         'created_at' => $tz,
@@ -42,15 +40,13 @@ class MaterielSeeder extends Seeder
                 }
 
                 foreach (['配合饲料', '氮肥', '磷肥', '钾肥', '钙肥', '有机肥'] as $name) {
-                    $random = mt_rand(50, 100);
-
                     $values[] = [
                         'name' => $name,
                         'type' => MaterielType::Fertilizer,
                         'year' => $year,
                         'quarter' => $quarter,
-                        'lowest_price' => $random,
-                        'highest_price' => mt_rand($random + 10, $random + 100),
+                        'lowest_price' => 0,
+                        'highest_price' => mt_rand(10, 150),
                         'created_by' => $admin->id,
                         'updated_by' => $admin->id,
                         'created_at' => $tz,