ing&geographic information center,zhejiang province,315000,China) Р Abstract:As the number of slopes construction increasing and diversifying forms of development, existing planning targets standards often lagging and inadequate. Faced when special building types not covered by existing standards, due to the lack of basis, review officer cannot be accurately calculated, it is not conducive to improving the efficiency of administrative examination and approval, and is not conducive to administration according to law and building a clean government. This paper focuses on problems in the current calculation method of mountainous building area, with Ningbo actual, mountainous building area calculation methods proposed amendments. Р Keywords : Mountainous building ,Calculation method,Suggestion