Abstract: The floral bud yield /plant ( y) and 13 quantitative traits of 20 Rosa rugosa cultivarswere investigated. Analysis of genetic correlation, correlative heritability ( h_xy ) and path analysis were carried out.
The results indicated: (1) the number of floral bud /p lant ( x₈ ) , the number of branches ( x₁₃ ) , the length of
the first petal ( x₃ ) , the length of the second petal ( x₅ ) , the length of floral bud ( x₁ ) had significant genetic
correlation with y; (2) h_xy of x₈ , x₅ , x₁₃ and x₁ related to ywere higher, respectively, and were close to heritability ( h² ) of y. The efficiency of correlation selection of these traitswould not be much lower than direct selection of y; (3) x₁ , x₈ , x₅ , x₁₃ , the fresh mass of pedals/ floral bud ( x₉ ) played an important positive role
in imp roving y according to decision coefficient.

Key words: Rosa rugosa, Genetic correlation, Correlative heritability, Path analysis, Decision coefficient