Control method of making random access flash memory optimum efficacy

The present invention relates to a control method capable of making random access flash memory obtain optimum effect. Said invention provides a setting method which uses page or uses block as unit to make said flash memory implement data access. When a host (for example, computer, card-reading machine and handset, etc.) can write a data into said flash memory, it can select the mode using page as unit to write said data or select the mode using block as unit to write said data according to the capacity of said data so as to obtain the goal of quickly-writing data.