Flash memory data transmission method, flash memory storage system and controller

The invention discloses a flash memory data transmission method, a flash memory storage system and a controller. The data transmission method is applied to data transmission from a cache memory to a plurality of flash memory groups through a single data bus in the flash memory storage system. The data transmission method comprises the step of: taking a logic block as a unit, and orderly arrangingand grouping data which are stored in the cache memory and belongs to continuous logical addresses; and the data transmission method also comprises the step of: transmitting sector data to each flashmemory group respectively through the single data bus according to the grouping in a staggering way, wherein the data belonging to the same logical block are to be transmitted and written into entityblocks of the same flash memory group. On the basis, the data are prevented from being dispersed into a plurality of entity blocks so as to reduce the abrasion of the entity blocks.