Abstract: To define yield components and theirs’ correlation of‘Puyi No.6’ coix，the influence of planting density and topping measure on‘Puyi No.6’ coix yield was studied, in order to provide theoretical evidence for the high-yield cultivation, management and production practice of‘Puyi No.6’ coix in Pucheng county. The influence of planting density and topping time and their interaction on the yield of‘Puyi No.6’ coix was analyzed by two-factor randomized block test. Correlation between yield components were conducted by path analysis to seek the optimal combination of planting density and topping time that lead to high-quality production of‘Puyi No.6’ coix. The results showed that planting density and topping time were the main factors that significant influenced the yield and its components of‘Puyi No.6’ coix. The yield was the highest when planting density was 66,700 plants per hm2 (with 60cm×75cm row space). Considering economic benefits, the optimal combination was planting density of 57,171 plants per hm2 (with 70cm×75cm row space) with topping when it had ten leaves and one terminal bud. Dwarfing effect of the tested time topping on‘Puyi No.6’ coix was not significant. Results from path analysis showed that the contribution of three coix yield components to the yield from high to low were seed number per plant, 100-seed weight and seed setting rate. Seed number per plant and 100-seed weight was the primary factors that affected coix yield, they should be chosen as the preferred indicators in breeding. Seed setting rate, which has greatly indirect effect on the yield increased, could be improved by changing planting density to achieve high coix yield.