Based on GIS technology, agricultural land gradation was studied applying factor method and modifying method in the centre of Leshan City, Sichuan Province.
以GIS为平台，采用修正法和因素法相结合，对乐山市中区农用地定级进行了研究。
2
After confirming the power of factor, choosing the model of gradation, the results of gradation was worked out by modifying method and factor method.
通过确定因素权重、选择定级模型，计算出修正法和因素法两种定级结果。
3
The rate of correct answer of the mainstay of hypertension therapy strategy and appraisal gradation principal of risk factor was less than 60.0%.