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The evaluation of network operation and maintenance quality is an important reference for carriers to improve their service. However, the traditional evaluation meth-ods involve so much human participation that it cannot cope with the explosive amount of data. Therefore, both the major carriers and researchers are trying to find solutions to evaluate the quality of network operation and maintenance more objectively and accu-rately. In this paper, we analyze the general process of quality evaluation models for net-work operation and maintenance. The process has four steps: 1) selection of evaluation indicators; 2) data process for chosen indicators; 3) determination of indicator weights;4) establishment of evaluation models. We further describe the working principle of each step, especially the methods for indicator selection and weight determination. Fi-nally, we review the recently proposed evaluation models and the intational stan-dards of network operation and maintenance quality evaluation.