Abstract: To improve the efficiency of screening out the elite cassava lines and lay the foundation for cassava breeding, this paper have discussed the correlation between cassava yield per plant and agronomic traits. Taken 13 cassava genotypes as materials, the correlation between yield per plant and some agronomic traits, and differences among different resources yield per plant was investigated via the method of correlation analysis, path analysis et al. The results showed that, the yield per plant of NK-2, NK-6, NK-7, NK-10, NK-11 and‘Xinxuan 048’were higher than that of SC205 significantly. The yield per plant was significantly positive correlated with the tuber number, positive correlated with harvest index, biological yield, the longest length of tuber and the height of the stem, and significantly negative with dry matter content. Besides, the path analysis results showed that, the order to the direct path and determination coefficient of gronomic traits is consistent, in order, the tuber number, the longest length of tuber, the biological yield, the main stem height, leaf retention height, dry matter content, harvest index, the upper ground fresh weight, starch content, main stem diameter and plant height. It could see that improving the cassava yield needs to mainly focus on the following agronomic traits, such as the tuber number, the longest length of tuber, the biological yield, the main stem height, leaf retention height, dry matter content and harvest index.