Utilize a pattern generator to write a predetermined logic voltage to each memory cell of a memory chip. Read a predetermined logic voltage stored in the memory cell. Compare the predetermined logic voltage stored in the memory cell with the predetermined logic voltage to determine if the memory cell is a good memory cell or not and store a determination result corresponding to the memory cell in a data latch of the memory chip. And determine if the memory chip is a good memory chip or not according to determination results of all memory cells of the memory chip stored in the data latch of the memory chip.