Associated gas will be recycled during the processing of oil and gas on the offshore platform. The reciprocating compressor may be used for compression commonly. However, the screw compressor has more advantages compared with the reciprocating compressor. We describe the application of screw compressor based on a project on an offshore platform. The floorage of the screw compressor unit is about 43.8% of that of a reciprocating compressor unit, and the weight of the screw compressor unit is about 40.2% of that of a reciprocating compressor unit.