According to the grade evaluation criteria of heavy metal pollution, the authors carried out the pollution grade evaluation for soil heavy metals in Taiyuan basin using the ideal point method. Two means were chosen for the evaluation: one includes the reference value of the grade standard in the evaluation criteria as the biggest level of the pollution grade, and the other only considers the 1st ~ 5th level of the evaluation standard value, with no consideration given to the reference value. It is shown that the first means weakens the whole pollution situation of Taiyuan basin, whereas the second means can separate pollution degrees of various areas preferably and reflect the pollution situation specifically, thus fairly satisfactorily preserving the pollution information. The evaluation results indicate that the points of relatively low pollution degrees are concentrated in mountain areas, while the points of rather high pollution degrees are distributed along the Fenhe River valley. As for urban pollution, Taiyuan, Yuci and Fenyang-Xiaoyi areas are subjected to rather heavy pollution, Taigu and Qixian possess the second place, and the soil environment of Qingxu, Jiaocheng, Wenshui and Pingyao is comparatively clean.