Abstract: Three-dimensional pattern of air-condition pipelines was established by Pro/E software, transferred to ANSYS environment, and a pipeline finite element analysis model constructed to caculate the first 20 stairs inherent frequency and vibration mode. Simulating compressor excitation and analyzing pipeline vibration re-ponse characteristics, an optimization design scheme for decreasing the matched pipelines vibration was obtained by caculation and analysis. This demonstrated that it was feasible to decrease air-condition pipelines vibration by the finite element technology of ANSYS software.