diff --git a/app/Services/DeviceWarningService.php b/app/Services/DeviceWarningService.php
new file mode 100644
index 0000000..74163f5
--- /dev/null
+++ b/app/Services/DeviceWarningService.php
@@ -0,0 +1,110 @@
+<?php
+
+namespace App\Services;
+
+use Illuminate\Database\Eloquent\Model;
+use Peidikeji\Setting\Models\Setting;
+use App\Models\DeviceWarning;
+use App\Models\WaterQualityMonitoringLog;
+use App\Models\SoilMonitoringLog;
+use Carbon\Carbon;
+use App\Models\Device;
+
+class DeviceWarningService
+{
+
+    /**
+     * 警报字段对应中文
+     *
+     * @var array<string,string>
+     */
+    protected $columnTexts = [
+        'temperature' => '温度',
+        'conductivity' => '电导率',
+        'humidity'=>'湿度',
+        'n'=>'氮',
+        'p'=>'磷',
+        'k'=>'钾',
+        'oxygen' => '溶解氧',
+        'chlorine' => '余氯',
+        'turbidity' => '浊度',
+        'ph' => 'ph值',
+    ];
+
+    protected $columnUnit = [
+        'temperature' => '℃',
+        'conductivity' => 'us/cm',
+        'humidity'=>'%RH',
+        'n'=>'mg/kg',
+        'p'=>'mg/kg',
+        'k'=>'mg/kg',
+        'oxygen' => 'mg/L',
+        'chlorine' => 'mg/L',
+        'turbidity' => 'NTU',
+        'ph' => '',
+    ];
+
+    public function judgeLog(Device $device, Model $log, Carbon $reportedAt){
+        $slug = '';
+        switch ($log::class) {
+            case SoilMonitoringLog::class://土壤监测
+                $slug = 'device_warning_rule_soil';
+                break;
+            case WaterQualityMonitoringLog::class://水质监测
+                $slug = 'device_warning_rule_waterquality';
+                break;
+        }
+
+        $rule = Setting::where('slug', $slug)->value('value');
+        if($rule){
+            $rule = json_decode($rule, true);
+        }
+
+        foreach($rule as $key => $values){
+            $_value = $log->$key ?? null;
+            $_warning = false;
+            $_lv = 0;
+            if($_value){
+                foreach($values as $lv => $value){//1-4级警报
+                    foreach ($value as $item){
+                        if($item['min'] && empty($item['max'])){//设置了最小值，未设置最大值
+                            if($_value >= $item['min']){
+                                $_warning = true;
+                                $_lv = $lv;
+                                break 2;//跳出2层循环
+                            }
+                        }elseif(empty($item['min']) && $item['max']){//设置最大值，未设置最小值
+                            if($_value < $item['max']){
+                                $_warning = true;
+                                $_lv = $lv;
+                                break 2;//跳出2层循环
+                            }
+                        }elseif($item['min'] && $item['max']){//最大值，最小值都有设置
+                            if($_value >= $item['min'] && $_value < $item['max']){
+                                $_warning = true;
+                                $_lv = $lv;
+                                break 2;//跳出2层循环
+                            }
+                        }
+                    }
+                }        
+            }
+
+            if($_warning){//插入警报内容
+                $this->inLog($device->sn, $reportedAt, $log, $_lv, $key);
+            }
+        }
+    }
+
+
+    private function inLog(string $deviceSn, Carbon $reportedAt, Model $log, $lv, $column){
+        DeviceWarning::create([
+            'device_id' => $log->device_id,
+            'base_id' => $log->agricultural_base_id,
+            'lv'    => $lv,
+            'content' => $this->columnTexts[$column] . '达到' .$log->$column. $this->columnUnit[$column],
+            'linkos_device_id' => $deviceSn,
+            'linkos_reported_at' => $reportedAt
+        ]);
+    }
+}