Research conclusions:From the discussion on he overallgeological survey forMetro Line 2 inXia' n, it is concluded for the overall survey the key points and difficult points in the survey should be analyzed and judged, and the survey principle, the technical requirement and implement outline for the rock should be worked ou.t For ensuring reasonableness of the survey plan, the survey plan should be optimized, the factors and main links to influence the survey quality should be controlled, the operational procedure should be standardized, the survey report should be checked strictly, the correct geological information and the technical service should supply to the design and construction.