Betula platyphylla var. mandshurica Hara. is a geographical variant of B. platyphylla Suk. with strong adaptability,rapid growth,fine texture,wide application and other notable features. In order to investigate the genetic effects of quantitative traits and specificity of different populations of B. platyphylla var.mandshurica Hara.,by permanent sample plot continuous measurement and temporary sample plot random investigation,B. platyphylla var. mandshurica Hara.populations naturally distributed in Zhangguangcailing Mountain and Laoye Mountain in Changbai Mountain Range were used as experimental materials to systematically analyze the growth dynamic patterns of plant height and diameter at breast height,and comprehensively evaluate the genetic effects of various quantitative traits. According to the results,site conditions suitable for B. platyphylla var. mandshurica Hara. were classified into four grades according to the absolute value of partial correlation coefficients. The growth process of B. platyphylla var. mandshurica Hara. stand generally underwent rapid growth period,steady growth period and slow growth period. The growth of B. platyphylla var. mandshurica Hara. stand at different growth stages varied significantly among various site grades,but the growth trend was basically the same. Plant height,diameter at breast height,east-west crown diameter and north-south crown diameter varied significantly among B. platyphylla var. mandshurica Hara. populations,exhibiting extremely significant differences. The heritability of four growth traits was 0. 558,0. 762,0. 652 and0. 722,respectively; the genetic gain was 8. 09%,17. 67%,14. 56% and 17. 53%,respectively. Based on comprehensive evaluation of various indicators,MES( Maoershan) was identified as an excellent population,which exhibited minor variations between individuals within the population,stable growth,strong growth potential and remarkable genetic effects. Betula platyphylla var. Mandshurica Hara. Is a geographical variant of B. platyphylla Suk. With strong adaptability, rapid growth, fine texture, wide application and other notable features. In order to investigate the genetic effects of quantitative traits and specificity of different populations of B. platyphylla var. Commandshurica Hara., By permanent sample plot continuous measurement and temporary sample plot random investigation, B. platyphylla var. Mandshurica Hara.populations naturally distributed in Zhangguangcailing Mountain and Laoye Mountain in Changbai Mountain Range were used as experimental materials to systematically analyze the growth dynamic patterns of plant height and diameter at breast height, and comprehensively evaluate the genetic effects of various quantitative traits. According to the results, site conditions suitable for B. platyphylla var. mandshurica Hara. were classified into four grades according to the the absolute value of partial correlation coefficients. The growth p stand growth of B. platyphylla var. mandshurica Hara. stand generally different under various growth grades, but the growth trend was basically the same. Plant height, diameter at breast height, east-west crown diameter and north-south crown diameter similar across among B. platyphylla var. mandshurica Hara. populations, exhibiting extremely significant differences. The heritability of four growth traits was 0. 558,0. 762,0. 652 and 0. 722, respectively; the genetic gain was 8. 09%, 17. 67%, 14. 56% and 17. 53%, respectively. Based on comprehensive evaluation of various indicators, MES (Maoershan) was identified as an excellent population, which showed minor minor differences between individuals within the population, stable growth, strong growth potential and remarkable genetic effects.