This invention discloses a memory control circuit and a method thereof. The memory control method includes the steps of: transmitting a first clock to a serial peripheral interface (SPI) NOR flash memory; transmitting a read instruction to the SPI NOR flash memory; waiting for a read waiting time period, which is associated with a specification of the SPI NOR flash memory and a cycle of the first clock; waiting for a delay time period, which is associated with a delay setting value and a cycle of a second clock different from the first clock; receiving read data returned from the SPI NOR flash memory; and adjusting the delay time period according to whether the read data are correct or not. This invention improves the stability of read operation of the SPI NOR flash memory and has advantages of simple circuit and flexible adjustment.