Hand-eye coordination and the power of arm muscle with the ability of under passing of volley ball. This purpose of research to determine is there a relationship between the hand-eye and the power of arm muscle with the ability of under passing of volley ball at SMP Tri Sukses Natar, South Lampung. The method used in this research is descriptive method Correlational. Population and Samples in this study amounted to 30 male students. And then, the data were analyzed using Pearson Product Moment Correlation. The result of the calculation of the variable correlation test hand-eye (X1) to the ability of under passing of volley ball (Y) obtained 0,542. The calculation result between power of arm muscle (X2) on the ability of under passing of volley ball (Y) obtained 0.354. The result of the calculation of multiple correlation analysis with F test shows result 15, 80 with Ftabel of 3.28 with a significance level of 5%(0.05). It concluded that two independent variables had a significant relationship with the dependent variable.