Abstract: On the basis of the complex-ecosystem theory,the framework system and evaluation index of technology decisions were constituted for rural sewage treatment. Meanwhile,the characters of three typical case villages on geography,climate and economy were considered with empirical research,through the Yaahp software implementation based on Analytical Hierarchy Process (AHP). Then some conclusions were indicated that bio-contact oxidation tank,stabilization pond and soil infiltration system conformed to the actual situation of different villages,respectively. According to the technical performances and economic indicator,sensitivity analysis results showed that the change of the indicators weight didn't affect the result of technical solution.