Abstract: [Objective] To adopt crop nutrition diagnosis technology and establish fertilizer nitrogen diagnosis period model of drip irrigation wheat based on the plant nitrate.[Method] Determine plant nitrate content of key growth period of drip irrigation wheat through the relationship between nitrate concentration and N application rate and the yield and establish the fertilizer nitrogen diagnosis model of the key remaining period.[Result] There was a very significant correlation between nitrate content of drip irrigation wheat plant stem base and the yield at different development stages,and the nitrate critical value of jointing stage and booting stage were 2 782.5 and 2 553.06 mg/kg,which established spring wheat jointing stage and booting stage fertilizer fertilization model of drip irrigation wheat.[Conclusion] The plant nitrate of irrigation wheat the of jointing stage and booting stage as a diagnostic index was used to establish the corresponding application model and calculate the different nitrate test values corresponding to the amount of nitrogen fertilizer at the drip spring wheat jointing stage and booting stage.