Abstract: In order to establish a precise evaluation system forsaline-alkali tolerance of rice at gernination stage,the molar ratio of NaCl∶Na2SO4∶NaHCO3∶Na2CO3=1∶9∶9∶1was used to simulate the mixed salt solution in the saline alkali land of Songnen Plain.And used the gradient test to screen the stress concentration range of the mixed salt and alkali solution,so as to determine the best concentration for the identification of saline-alkali tolerance of rice at the gernination stage.243rice materials were identified for saline-alkali tolerance at gernination stage with a certain concentration of salt and alkali mixture.The results showed that the optimum concentration was 125mmol·L-1 of salt alkali mixture.Under this concentration,72varieties with extremely strong saline-alkali tolerance and 77varieties with strong saline-alkali tolerance were obtained from 243varieties;There were 57varieties with medium saline-alkali tolerance,27varieties with weak saline-alkali tolerance and 10varieties with extremely weak saline-alkali tolerance.