To simplify the processing technology,the labyrinth like screw seal is used to replace the traditional labyrinth seal during the machining process of labyrinth reciprocating compressor.The sealing performance between the labyrinth seal and the labyrinth like screw seal was compared,and the sealing mechanism of labyrinth like screw seal was analyzed.By dividing the energy dissipation of labyrinth like screw seal into the energy dissipation of labyrinth like seal and the energy loss at groove direction,the sealing performance of the labyrinth like screw seal was simulated by using CFD method.The results show that the sealing performance of the labyrinth like screw seal is less than that of traditional labyrinth seal,but the sealing effect difference is within 5%.It is completely feasible to use the labyrinth like screw seal instead of the labyrinth seal with considering processing technology,economic benefit and other factors.