The invention relates to a method for grading land resource evaluation factors based on the clonal selection algorithm, which makes full use of the advantages of the clonal selection algorithm in optimization problem solving and introduces the clonal selection algorithm into evaluation factor grading problem. According to the characteristics of the evaluation factor grading problem, a clonal selection algorithm affinity function and constraint conditions are designed, and a clonal selection algorithm model suitable for evaluation factor grading is constructed. The method provided by the invention can provide scientific and accurate basis for factor impact analysis for land resource quality evaluation, and further provides technical support for rational utilization of land resources.