Abstract: Many factors which have hierarchy and fuzzy characteristics can affect in-situ leaching mining.In order to analyze the feasibility of in-situ leaching in uranium deposits with sandstone type，a secondary fuzzy comprehensive evaluation methods was built based on analytic hierarchy process and fuzzy mathematics theory，in order to analyze the feasibility of in-situ leaching in uranium deposits with sandstone type.The secondary fuzzy comprehensive evaluation method was built based on analytic hierarchy process and fuzzy mathematics theory.finally established the theory of fuzzy comprehensive evaluation method based on AHP.The results show that the fuzzy comprehensive evaluation method based on AHP can be effectively applied in the feasibility of in-situ leaching in uranium deposits with sandstone type，which not only reflects the engineering reality，but also avoids the randomness produced by experts in judgment of the relative important degree of influencing factors.