In order to evaluate relations between phonological trains , yield components and grain yield of 30 soybean lines with different maturity groups , an experiment conducted as a randomized complete block design with three replications at the agricultural research station of agriculture and natural resources research center, Gorgan, Golestan Province in 1388. 13 traits of vegetative and reproductive growth stages, yield components, seed protein and its oil content were evaluated. Number of days to flowering, number of branches per plant, number of pods on main branches, the number of days to maturity, yield components and grain yield had positive correlation and significant effect. Grain protein and grain shell weight ratio had a significant and negative correlation with grain yield. In the stepwise regression model,79% changes in seed yield by number of days to flowing, seed number per plant , number of branches per plant, seed protein percent and weight of shell: seed ratio and 21% of remaining by other effect could be explained. The 5 are mentioned characters were used to analysis. Results showed that most direct and positive effect on seed yield related to the number of days to flowing and the number of branches per plant.

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