The invention provides a data write-in method, a memory storage device and a memory control circuit unit. The data-write-in method comprises the steps of writing first data belonging to a first logic sub-unit of a first logic unit and second data belonging to a second logic sub-unit of the first logic unit into a first solid erasing unit and a second solid erasing unit; recording using information recording to each logic unit; executing a data arrangement operation corresponding to the first logic unit according to the using information of the first logic unit to copy the first data and the second data to a third solid erasing unit from the first solid erasing unit and the second solid erasing unit, wherein a logic address scope of the second logic sub-unit follows a logic address scope of the first logic sub-unit.