Abstract: For purpose of more scientific management, the process equipments at station of gas compressor station are classified by their importance. Critical evaluation factors for these process equipments are determined, which are mainly involved in two types (safety and environmental protection, and operation), and include many sub-factors. The weights and values of all indicators are calculated by the improved analytic hierarchy process (AHP), and the importance evaluation criteria of process equipment are formulated. According to the evaluation criteria, the process equipment at the pilot gas compressor station is evaluated and divided by risk levels (high, moderate and low) in light of "the 80/20 Rule". This kind of division ties in with the practices, which means that the evaluation criterion for process equipment importance is reasonable and feasible. Recommendations on optimal management of process equipment maintenance and repair are proposed as follows: (1) high-risk equipments are specifically managed by a joint way of status monitoring and regular maintenance; (2) low-risk equipments are managed by way of corrective maintenance or regular maintenance; (3) moderate-risk equipments are managed by a way between (1) and (2); and (4) the ERP equipment fault dictionary is optimized.