1. First of all, the specific purpose of purchasing foreign exchange should be made clear before purchasing foreign exchange, such as traveling abroad, studying abroad, traveling on business, etc.

2. Secondly, choose a qualified bank to understand the bank's foreign exchange purchase business.

3. Then, according to the different needs of foreign exchange purchase, prepare the corresponding materials.

4. Then, fill in the application form for purchasing foreign exchange at the bank counter or through the bank official website, mobile banking and other channels.

5. Then, hand over the completed application form and materials to the bank staff.

6. After approval, the amount of foreign exchange purchased shall be paid according to the requirements of the bank.

7. Finally, after purchasing foreign exchange successfully, you can collect foreign exchange cash at the bank counter or deposit it in the designated foreign exchange account.