可变分区方式是按作业需要的主存空间大小来分割分区的。当要装入一个作业时，根据作业需要的主存量查看是否有足够的空闲空间，若有，则按需要量分割一个分区分配给该作业；若无，则作业不能装入。随着作业的装入、撤离，主存空间被分成许多个分区，有的分区被作业占用，而有的分区是空闲的-Variable district is operating in accordance with the needs of the size of main memory space to split the district. When an operation to load, in accordance with operational requirements of the main stock to see if there is sufficient free space, if so, according to requirements of a sub-partition allocated to the operation　and if not, can not be put into operation. With the operation of the load, withdrawal, main memory space is divided into many districts, some district was occupied by operations, while others are free District