If you open a store on Taobao, you can apply to become a partner of Alibaba through Taobao Alliance.

The specific steps are as follows:

1. Log in to the official website of Taobao Alliance (https://pub.alimama.com/).

2. Select "Account Management" at the top of the homepage and log in to the Taobao Alliance account. If you don't have an account, you can register a Taobao Alliance account first.

3. After logging in, select "Alimama Alliance" in the menu bar on the left side of the page to enter the advertising management platform of Taobao Alliance.

4. Select "Alimama Partner Program" in the menu bar on the left side of the page to enter the Alimama Partner Program page.

5. Click the "Apply for Cooperation" button at the top of the page, fill in the relevant information, and submit the application.

6. After waiting for Alibaba to review and approve it, you can cooperate with Alibaba.

It should be noted that after the application is successful, you need to select Alibaba's advertising promotion plan in Taobao Alliance, obtain the promotion link, and place the link in your Taobao store. When customers purchase Alibaba products through your promotional link, you can get corresponding commission income.