The article submits for consideration the new approach to designing and computation of positive displacement compressors, in particular of screw type. To ensure the higher effectiveness of compression process, to increase the operation reliability due to reduction of dynamic load and gas pulsation, it is offered to carry out designing of compressor operating members in a such way that the specific work of compression would be uniform along the whole compression cycle. The article proposes the screw compressors manufacturing with screws having variable on length diameter, pitch and profile. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/1437