If you already have a Taobao store and want to expand the market for your products, you can join your store on AliExpress in the following ways:

1. Log in to the official website of AliExpress (https://www.alibaba.com/), find the "Free Join" or "Free Registration" button, and click to enter.

2. Register an account - Provide your email address and password on the registration page, and set your username and login password. If you already have other accounts of Alibaba Group (such as Taobao, Tmall, etc.), you can use the account information to quickly register and link your Taobao store.

3. Fill in company information - After completing the basic registration, you need to fill in some necessary company and account information, including company name, address, contact number, business license and other supporting materials. After uploading the corresponding documents according to the system prompts, your registration application will be sent to AliExpress reviewers for review.

4. Prepare to put products on the shelves - Through the AliExpress management backend, find the "Product Management" option in the "My AliExpress" or "Seller Center" page, click the "Add Product" button, and fill in the relevant product information, such as title, description, price, inventory, logistics and other parameters. When entering product information, you can choose to directly copy and paste the product information of your Taobao store, and make appropriate modifications and optimizations.

5. Conduct review and release - After completing the product information entry, you need to wait for AliExpress reviewers to review your store and products. Once the review is passed, you can put the product on the shelves and sell it. After the product is released, you can make corresponding optimizations and adjustments based on AliExpress's operation and promotion strategies to achieve better sales results and customer satisfaction.