Abstract
The reasonable wavefunctions of the vector mesons ρ, K* and D* are proposed and their properties are discussed. We calculated the decay processes D, B → Vlν and PV. Comparison of the results of our model with those of the Bauer-Stech-Wirbel (BSW) model and the experimental data are given. We also obtained the upper limit of Vub which is smaller than that of BSW model.