The split-spot design was applied in this experiment，set the nutrient solution concentration was set as the mainarea，and the spray frequency as the sub -area.Pre-stage and late-stage were set up accoording to the formation of potato tubers.The effect of different nutrient concentration and spray frequency on potato growth and yield under different growthstages was studied by this experiment，which could provide a reference to practical production of original potato.Thenutrient solution concentration gradient was set to 0.6 A∶0.8A(pre -stage:late -stage)，0.8 A∶A，A∶1.2A，with C 0.6∶0.8， C0.8∶1，C1∶1.2，the spray frequency was set to 40 s/10 min∶40 s/20min(spray/interval，pre -stage:late -stage)，40 s/15min:40 s/25min，40 s/20min:40 s/30min，which were expressed with by T 10∶20，T15∶25，T20∶30，respectively，andthe principal component cluster method was used to evaluate each thetreatments，and sorted them comprehensively.Theresults showedthat，30 days afterplanting，the nutrient solutionconcentration，the spray frequency and the interaction between two factors could significantly increased the dry weight of all parts of the potato and the treatment C0.8∶1T20∶30 was themaximum；60 days afterplanting，the biomass difference between treatments was significant and treatment C 1∶1.2T20∶30 hads the largest dry weight of whole plant.Small potato as G ≤ 3 g of each treatment accounted for the largest proportion of potatograding，small potato as 3 g