Five years. Fund, in English, refers to a certain amount of funds set up for a certain purpose in a broad sense. Among them, the retention period of customer information of fund operating institutions stipulates that customer identity information shall be kept for at least 5 years from the year when the business relationship ends or the one-time transaction is recorded. Information storage is an important aspect of information system. Without information storage, we can't make full use of the collected and processed information, and at the same time, we have to spend money, people and things to organize the re-collection and processing of information.