Abstract: This experiment takes 7 optional edible sunflower crosses, and studies the agronomic characters, economic characters and Photosynthetic Characters of the 7 varieties by random permutation and combination.. The results show that the 17 characters in the single disc grain number, grain weight per plant, photosynthetic rate, intercellular CO2 concentration, growth period and stem diameter and the results were significant or very significant correlation between the 6 further; the characters and yield of path analysis showed that grain number, single disc grain weight per plant, photosynthetic rate （Pn）, intercellular COz concentration （CO2）, growth period and stem diameter of 6 parameters determine the variation of seed yield in 98.65%, the single disc grain weight on yield directly the largest contribution, followed by photosynthetic rate, again for the intercellular CO2 concentration, growth period of the yield contribution rate reached 0.389 5 while the single disc grain number and stem diameter direct contribution to yield is very small, its contribution to yield mainly through the grain weight per plant and growth period to achieve.