Abstract: To accurately determine the patches of selenium(Se)-rich paddy fields, this study carried out geochemical analysis on soils from the Qipanshan Se-rich area, Changshan County in western Zhejiang Province. Based on 1:10 000 Geochemical Evaluation Criterion of Land Quality(an ave. sampling density of 25.6 pieces/km²)and average assigned values of non-sample patches at an average sampling desity of 55.2 piece/km², Se contents of Se-rich soils and evaluation results of Se-rich patches in the hilly areas were obtained. The results show that the qualified rate of two differences between non-sample pattern assignment and measured value is 60.71%, with the consistency rate of selenium-rich pattern determination up to 63.64%. The accuracy of sampling evalution of the 1:10 000 geochemical evalution for land quality in the study area is still difficult to meet the requirement of accurate determination of Se-rich patches. Therefore, sampling density should be increased appropriately, and deployment for sampling positions should be under control especially in no actual measured patches around non-sample patches.