The invention provides a capacity adjusting control method of a multi-
nose screw compressor. The capacity adjusting control method solves the problem that the existing multi-
nose screw compressor unit in an
operation mode is poor in
lubrication. The capacity adjusting control method of the multi-
nose screw compressor comprises the following steps of 1, starting up and judging whether loading is required; 2, detecting the
running time of each compressor before the loading; 3, loading the compressor with the shortest
running time; 4, loading the compressor with the second shortest
running time; 5, loading gradually and sequentially till the load requirement is met; 6, judging whether unloading is required; 7, detecting the running time of each compressor before the unloading; 8, unloading the compressor with the longest running time; 9, unloading the compressor with the second shortest running time; and 10, unloading gradually and sequentially till the load requirement is met. According to the capacity adjusting control method, for a condition that poor
lubrication can occur when the compressor runs in a partial load state for a long time, a controller controls each compressor to act sequentially and adjacently according to the running time, so that oil return of the compressor is good, and the operation quality of the compressor can be improved.