Abstract: Taking‘Ziguan No.8’‘Ziguan A11’‘Ziguan D5’‘Ruifeng No.9’as test materials,varieties of each set of three kinds of density of 30 000,37 500,45 000 plants·hm-2,respectively,the quality of varieties of dry matter,fruit character,seed properties,transpiration rate（Tr）,stomatal conductance（Gs）,intercellular CO2 concentration（Ci）and the production index were measured and compared,in order to screen out good character and high yield of the optimum planting density,hoist further standar dization for seed planting and provide reference for high production and efficiency.The results showed that with the increase of density,the dry matter mass of the varieties increased first,reaching the maximum of 547.15,558.26,527.19 g·plant-1 and 536.24 g·plant-1 at the density Ⅱ37 500 plants·hm-2,and then decreased with the increasing of density.Transpiration rate and stomatal conductance of cultivars showed a trend of gradual decrease,which was embodied in densityⅠ＞density Ⅱ ＞density Ⅲ and the treatment of each density was significantly different.With the increase of density,intercellular CO₂ concentration of different varieties showed a trend of increasing gradually,which was embodied in density Ⅲ ＞ density Ⅱ ＞ density Ⅰ,there were significant differences among the density treatments.There was no significant effect of density on fruit and grain characters.There were significant differences in the effect of density on the yield of varieties.When the density Ⅱ was 37 500 plants·hm^-2,the maximum yield of each variety was 2 161.08,2 027.68,1 907.62 kg·hm^-2 and 2 107.72 kg·hm^-2,respectively.To sum up,the dry matter,quality,photosynthetic characteristics and yield of the varieties with the density of Ⅱ37 500 plants·hm^-2 were all superior when the variety of short vine was selected as seed‘Ziguan No.8’and the variety of long vine was selected as‘Ruifeng No.9’.