The purchasing method is as follows:

1. Search the official website of Caihua Trading to understand the product catalog and purchasing policy.

2. Register as a member of Caihua Trading and place orders and pay online.

3. According to the guidelines on the website, select the required products and add them to the shopping cart.

4. After confirming that the items in the shopping cart are correct, proceed to checkout.

5. Fill in the delivery address and payment method as required, and submit the order.

6. Wait for the shipment from Caihua Trading, pay attention to the order status, and ensure the safe delivery of the goods.