Kjeldahl distillationtitration has been used as a reference method for N determination in plants，but it is time consuming.This article aimed at establishing a time saving method for determining of plant N concentrations by continuous flow analyzer（CFA).Twenty four of wheat plant samples were selected and digested with H2SO4H2O2.N contents in the digests were determined by CFA and an automated Kjeldahl distillationtitration(AKDT）instrument，respectively.The test showed that there was no any significant difference of the plant N contents measured by the CFA and the AKDT method.A linear relationship best described the measured N values generated by both methods：CFA-N=0.892 AKDT-N +0.753.The Pearsons correlation coefficient was 0.942 1 with a significance level（n=24，P<0.01).The CFA method for plant N measurement had a high precision with relative standard deviation less than 5%.The standard recovery rate of feed samples with addition of（NH4)2SO4 was 96.6%~102.3%.It suggested that the CFA based on colorimetric detection of the pure ammonium chloride distillate（Berthelot reaction）could be used to determinate N in the Kjeldahl digests of plant samples.The CFA method was labor saving and could handle large numbers of samples.The human error in mixing and other operations was reduced to a great extent.