Abstract: Based on centrifugal compressor performance conversion method, two-step fitting characteristic curves of variable speed and calculation of gas physical property via BWRS EOS, using Java programming language via NetBeans IDE 6.7 and Excel, centrifugal compressor performance evaluation software is developed. The software can calculate gas physical property parameters related to compressor exactly, read characteristic curve digital image automatically, converse characteristic curves in variable work conditions, fit characteristic curves of variable speed and define flow control limit of compressor. Using the history operation data of the first compressor station of a gas transmission pipeline, the accuracy of characteristic curves given by the software is verified and then the software can be used in optimizing compressor operation scheme.