Six tomato cultivars(Fen HV-071,Zhongza No.9,Jinzhu HV-029,Dashengnv HV-073,Lvguo and TTI1103B-2) were treated for 12 days with 6 different osmotic concentrations of PEG 6000(7.5%、10%、12.5%、15%、17.5% and 20%)respectively during germination stage.Germination energy,germination rate and other 6 germination indexes were measured and analyzed by subordinate function and grey correlative degree analysis methods for screening the optimum osmotic stress concentration and evaluation indexes of drought resistance id...