Abstract: In order to explore the accordance and standard of selection in seedling stage of Pinus yunnanensis ,we analyzed the growth character differences of annual seedlings on twenty families,that can speed up the exploitation and utilization of the existing excellent genetic resources early and in short time,The results showed that in both height and diameter growth aspects,there was very significant difference among families and different individuals of the same family,height growth difference significantly greater than the one in diameter.So we selected superior seedling using the sum of average growth and standard deviation as the minimum standard.There were 1 629 plants to be selected in the 11 331 breeding population, the ratio is 14.3%.The mean height of the superior seedlings is 8.92 cm,it is more than the average of overall 35.9%,and the mean volume of diameter is 3.48 mm,it is more than the average 3.6%.