Based on the remediation effects of soil, four different amendments are studied by the pot experi-ment of arsenic contaminated soil to determine the optimal remediation model. The soil remediation contribu-tion value for different amendments is evaluated by grey relevant analysis and cluster analysis. The evalua-tion indexes include biomass yield, agronomic characters, and absorption amount of arsenic of lettuce. Re-sults show that the phosphorus plaster treatment(20g/kg), with greatest grey relation degree(r =0.824)and optimal cluster analysis, is the best amendment for the soils contaminated by arsenic.