79 bacteria strains isolated from cucumber seeds and seedlings were preliminarily classified as Bacillus spp, Agrobacterium, Xanthomonas spp?Pseudomonas spp, Erwinia spp, Curtobacterium. The quantity of endophytic bacteria varied in tissues. The population of the endophytic bacteria was highest in roots,which were 2.63×105 CFU/g in fresh weight;secondly in stem,thirdly in cotyledon and lowest in seed. The structure of dominant endophytic bacteria strains in variety was equality,but the quantity of endophyti...