Abstract: During water flooding development of low permeability reservoir,due to fracture development,reservoir heterogeneity and other factors,the injected water may be channeling along the preferential channel and results in water flooded of oil wells and declined production.In order to effectively and accurately identify preferential channels of water channeling,in consideration of channeling reservoir between injectorproducer and production dynamic factors,by use of the analytic hierarchy process(ahp)and fuzzy comprehensive evaluation method,the various factors effect has been calculated,the quantitative discriminant model of preferential channels between inter-wells have been established,and the quantitative evaluation on channeling degree of single well has been made.The examples show that the quantitative fuzzy discriminant method of preferential channels is simple and convenient,being of high conformity degree with the actual status and has good guidance meaning for filed application.