Can't sign three-party depository. You don't need a bank card to open a stock account, but you need to sign a tripartite depository with the bank for trading. Postal savings office does not support tripartite signature yet.

The company has cooperated with the following banks to open the third-party depository business of customer transaction settlement funds: Industrial and Commercial Bank of China, Agricultural Bank, China Construction Bank, Bank of Communications, China Bank, China Merchants Bank, Industrial Bank, China CITIC Bank, Shanghai Pudong Development Bank, Shenzhen Development Bank, Bank of Beijing, Minsheng Bank, Huaxia Bank, China Guangfa Bank, China Everbright Bank and Nanjing Bank. You can choose any one of these 16 banks to handle the three-party deposit, and the Postal Savings Bank does not support this business for the time being.