The mechanism of increasing yield and sucrose content of cane by applicationof the Nitropotassium Aquesous Agent(2 % CNKAA) in Sugarcane was studied bymeans of pot experiments with two sugarcane varities,Yutang 71/210 and Yutang63/237.The method of the application of CNKAA included seed soaking,rootapplication and foliage spray with0.000 4% or 0.000 6% solution.The experimentalresults sho wed that CNKAA could promote the germination rate of seed cane,impro ve the capacity of root absorption and root transportation,and increasethe photosythesis rate of leaves.It could coordinate the proeess of internalphysiology and chemical reaction,regulate the internal metabolism,and promote thecane growth and sucrose accumulation.The final results indicated that CNKAA couldincrease the numbers of cane stalk per area and the weight per cane stalkSo,It couldincrease the cane yield and the sucrose content of cane,decrease the reducing sucrosecontent of juiee and improve the juice quality.