On April 1 day, the People's Bank of China began to ask for a letter of commitment. According to the inquiry of China People's Bank official website, from April 1, individuals need to sign a letter of commitment to open settlement accounts such as bank cards at the counter of China People's Bank, and the account holder will read the contents and sign for confirmation. The People's Bank of China (PBOC) is the central bank of People's Republic of China (PRC), responsible for formulating and implementing monetary policies, maintaining financial stability, managing the country's foreign exchange reserves, supervising financial institutions and issuing RMB. The People's Bank of China plays an important role in China's financial system and plays a key role in national economic development and financial market stability.