The memory expansion function of Xiaomi 1 1 allows the mobile phone to temporarily occupy a part of the mobile phone memory, thus increasing the running memory capacity of the mobile phone, which is equivalent to temporarily changing the storage memory of the mobile phone into the running memory. However, because the allowed memory of Xiaomi 1 1 mobile phone is basically enough, the effect of memory expansion is not obvious, and the function of expanding memory is not commonly used by most users.