The evaluation of the regional water saving irrigation development level is a multi － level，multi － index and multi － factor comprehensive process． The multi － index comprehensive evaluation is to consider several multiple indexes of information reflecting the research object of different properties and get the evaluation results，hence to reflect the whole situation of the evaluation objects． The research establishes an evaluation model based on the technique for order preference by similarity to ideal solution，builds the comprehensive evaluation index system of water saving irrigation development level at Fen river basin，determines the project indicators，selects a single index which belongs to the special index，and determines the individual index weight based on the entropy method and analytic hierarchy process． According to the calculation of the decision matrix calculation，the relative closeness coefficient，namely the evaluation grade standard，is obtained and the evaluation results is made． The results show that the calculation model is stable and reliable and the development level of water saving irrigation is at a low level．