diff --git a/README.md b/README.md
index 4db26e5..673edfb 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,27 @@
-# lambda-rainFallTrendAPI
\ No newline at end of file
+# lambda-rainFallTrendAPI
+
+## Overview
+現在の降水量の傾向を返します。  
+データは10分毎に更新されます。  
+データは30分前の傾向データになります。  
+
+## Request
+Method : GET  
+Endpoint : /production/rain-fall-trend/{country}/{prefectures}/{river}   
+Parameter :   
+1. {country} : 国名を指定 ex)japan, taiwan   
+2. {prefectures} : 都道府県を指定 ex)tokyo, taipei   
+3. {river} : 河川名を指定 ex)arakawa, danshui   
+
+## Response
+
+以下の Json を返します。
+~~~
+{
+  "timestamp": "2017-08-12T12:50:00",
+  "trend": "↑"
+}
+~~~
+
+timestamp : 分析時点の日時(UTC)  
+trend : 降雨量の傾向(↑、↓、→)  
diff --git a/lambda.json b/lambda.json
new file mode 100644
index 0000000..979578b
--- /dev/null
+++ b/lambda.json
@@ -0,0 +1,15 @@
+{
+  "name": "getRainFallTrend",
+  "description": "降雨量の傾向を取得する",
+  "region": "ap-northeast-1",
+  "runtime": "python3.6",
+  "handler": "lambda_function.lambda_handler",
+  "role": "arn:aws:iam::657885203613:role/lambda_athena_s3",
+  "ignore": [
+    "circle\\.yml$",
+    ".git",
+    "/.*\\.pyc$"
+  ],
+  "timeout": 300,
+  "memory": 128
+}
diff --git a/lambda_function.py b/lambda_function.py
new file mode 100644
index 0000000..c8be498
--- /dev/null
+++ b/lambda_function.py
@@ -0,0 +1,49 @@
+import json
+import urllib.parse
+import boto3
+
+client = boto3.client('s3')
+
+bucket = 'test-uodu-s3'
+target = 'trend'
+
+def get_rainfall_trend(key):
+    response = client.get_object(Bucket=bucket, Key=key)
+    body = response['Body'].read().decode('utf-8')
+    return body
+
+def set_response_body(status_code, body):
+    headers = {}
+    headers['Content-Type'] = 'application/json'
+    
+    res_body = {}
+    res_body['statusCode'] = status_code
+    res_body['headers'] = headers
+    res_body['body'] = body
+
+    return res_body
+
+def lambda_handler(event, context):
+
+    # クエリが渡されてない場合$
+    if (event['pathParameters'] is None):
+        return set_response_body(400, 'Bad Request No PathParameters')
+    else:
+        params = event['pathParameters']
+        
+    # クエリパラメータが不正な場合のデフォルトを荒川に
+    if (set(params) >= {'country', 'prefectures', 'river'}):
+        country = params['country']
+        prefectures = params['prefectures']
+        river = params['river']
+        key = target + '/' + country + '/' + prefectures + '/' + river + '/trendRainFall.json'
+    else:
+        return set_response_body(400, 'Bad Request No Item')
+    
+    try:
+        json_str = get_rainfall_trend(key)
+        
+        return set_response_body(200, json_str)
+    except Exception as e:
+        print(e)
+        return set_response_body(500, 'File Not Found')
diff --git a/test_200.json b/test_200.json
new file mode 100644
index 0000000..ef19db9
--- /dev/null
+++ b/test_200.json
@@ -0,0 +1,7 @@
+{
+  "pathParameters": {
+    "country": "taiwan",
+    "prefectures": "Taipei",
+    "river": "Danshui"
+  }
+}
diff --git a/test_400_bad_query.json b/test_400_bad_query.json
new file mode 100644
index 0000000..efa9a63
--- /dev/null
+++ b/test_400_bad_query.json
@@ -0,0 +1,7 @@
+{
+  "pathParameters": {
+    "country": "taiwan",
+    "prefectures": "Taipei",
+    "river": "D"
+  }
+}
diff --git a/test_400_no_item.json b/test_400_no_item.json
new file mode 100644
index 0000000..893deb3
--- /dev/null
+++ b/test_400_no_item.json
@@ -0,0 +1,6 @@
+{
+  "pathParameters": {
+    "country": "taiwan",
+    "prefectures": "Taipei"
+  }
+}
diff --git a/test_400_no_query.json b/test_400_no_query.json
new file mode 100644
index 0000000..698073c
--- /dev/null
+++ b/test_400_no_query.json
@@ -0,0 +1,3 @@
+{
+  "pathParameters": null
+}