A memory access method and a memory access system are provided. The memory access method is applicable to the memory access system. The memory access system includes a programmable logic device (PLD), a processor, a volatile memory, and a non-volatile memory. The PLD is disposed among the processor, the volatile memory, and the non-volatile memory. The memory access method includes: storing, by the PLD, data stored in the non-volatile memory to the volatile memory when the memory access system is started; and accessing, by the processor, the data from the volatile memory through the PLD.