Data write-in method, memory control circuit unit and memory storage device

The invention provides a data write-in method, a memory control circuit unit and a memory storage device. The data write-in method comprises the step of dividing logic units into a first region and at least one second region according to the number of write-in times of the logic units configured at the memory storage device, and also comprises the steps of: judging whether the logic unit corresponding to the received data belongs to the first region or not; when the logic unit corresponding to the received data belongs to the first region, programming the received data to a first action physical erasing unit; and when the logic unit corresponding to the received data does not belong to the first region, programming the received data to a second action physical erasing unit. Therefore the efficiency of the garbage collection operation can be effectively enhanced.