The present invention discloses a method for simulating user data storage in NandFlash. The method comprises: acquiring user data storage information of each physical sector in a physical page, and storing the user data storage information to a first storage unit of a data file, wherein each physical sector is used for storing 512 bytes of user data, and a length of the user data storage information is 8 bytes; and acquiring out-of-band data information in the physical page, and storing the out-of-band data information to a second storage unit of the data file, wherein the data file is stored in a memory. The method provided by the present invention can solve the problem of low user data access efficiency in an FTL (Flash Translation Layer) test.