For the purpose of training course refund, you can choose the following bank account types as the purpose:

1. current savings account: If you only need to temporarily store the refund amount, and you may need to use this fund frequently, a current savings account is a good choice. This kind of account has no deposit term and withdrawal limit, which is convenient for accessing funds at any time.

2. Time deposit account: If you don't intend to use the refund amount immediately and want to earn some interest income, then you can consider depositing the funds into a time deposit account. This kind of account has a certain deposit term, and the longer the term, the higher the interest income.

3. Monetary fund: Monetary fund is a low-risk, high-liquidity investment tool, usually managed by fund companies. Investing the refund amount in the money fund can get a certain income and can be redeemed at any time, which is very suitable for short-term fund management.

4. Alipay or WeChat wallet: If you are more accustomed to using the mobile payment platform for fund management, you can choose to transfer the refund amount to Alipay or WeChat wallet account. These accounts have convenient payment and transfer functions, and usually can obtain certain financial benefits.

It should be noted that everyone's specific situation and needs will be different. When choosing the type of bank account, we should measure and make decisions according to our own needs, capital scale and financial management ability. If necessary, I suggest you consult a professional bank financial adviser or financial institution for more specific advice.