diff --git a/README.md b/README.md
new file mode 100644
index 0000000..412684e
--- /dev/null
+++ b/README.md
@@ -0,0 +1,14 @@
+# SpreadsheetSpreadsheet
+
+- <span>High performance spreadsheet based on CanvasAPI.</span>
+- <span>TypeScript supported</span>
+
+<div>
+<span>Basic usage</span>
+
+```js
+import { Spreadsheet } from 'spreadsheet
+const target = document.querySelector('#spreadsheet_container')
+const spreadsheetInstance = new Spreadsheet(target)
+```
+</div>
\ No newline at end of file
diff --git a/src/main.ts b/src/main.ts
index bc45719..83d0ff9 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -45,14 +45,14 @@ export class Spreadsheet {
     public cache: Cache
 
     constructor(target: string | HTMLElement, props?: SpreadsheetConstructorProperties) {
-        const config = createSampleConfig(2000, 600)
+        const config = createSampleConfig(500, 500)
         if (props?.view) {
             config.view = props.view
         }
 
         this.config = new Config(config)
         this.sheet = new Sheet(this)
-        const data = createSampleData(2000, 600)
+        const data = createSampleData(500, 500)
         this.table = new Table(this)
         this.scroller = new Scroller(this)
         this.toolbar = new Toolbar(this)