Quantitative genetic analyses were performed to study the potential to bteed for improved body weight, body length, and condition factor in rainbow trout (Oncorhynchus mykiss) at different growth stage. In this study, samples were obtained from BaoHai Cold Water Fish Experimental Station of Heilongjiang River Fishery Research Institute, Chinese Academy of Fishery Sciences, based on 4026 hybrid individuals from the reciprocal crossing among the 5 strains between 2004 and 2006. Genetic parameters and breeding values of growth traits in rainbow trout were estimated with repeatability animal model. The fixed effects, which were included the yearseason, dam and sire strain, the permanent environment effects and the animal additive genetic effects were calculated. The phenotypic and genetic trends of growth trait in the rainbow trout were also analyzed. Growth traits were estimated utilizing Restricted Maximum Likelihood methods with a two generation pedigree. Results for heritability estimates for body length, body weight, and condition factor were 0.35, 0.10, and 0.34, respectively. The ranks of all kinds of onetrait estimated breeding values were greatly different from comprehensive estimated breeding value. And all the genetic evaluation methods also had significant correlations, which were 0.998, 0.877, 0.85, -0.071, -0.064 and -0.13. The genetic and phenotypic tendency of body length, body weight and condition factor was similar, so the selection of phenotypic value is more suitable in the study population.