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The evaluation system on geological environmental quality of Shuyang downtown area was built besed on 3 evaluating elements and relevant 10 evaluating factors�� The three elements concluded eological conditions�� engineering activities and environmental geological problems�� The weight and the membership function of evaluating factors were correspondingly determined by the Analytical Hierarchy Process and Fuzzy Mathematics�� The membership degrees were calculated by the membership function�� The fuzzy evaluation model was established besed on all this factors�� The present status of Shuyang downtown area was comprehensively evaluated by the model and adopted both qualitative and quantitative methods�� Generally Shuyang downtown is divided into three areas representing geological environmental qualityies as good ( ��) ��medium ( ��) and bad ( ��) respectively�� The results are basically identical with the investigation of the present situation��