Abstarct: The decay properties of various isotopes is studied by modifying the Coulomb and proximity potential model for both the ground (T=0) and excited (T≠0) state decays, using recent mass tables. The WKB approximation is used to determine the penetration probability of the emitted alpha. The half-lives are also computed using the Universal formula for alpha decay (UNIV) of Poenaru et al and the Universal decay law (UDL) of Qi et al, The Viola–Seaborg semi-empirical relationship (VSS), the analytical formulae of Royer, Semi-empirical formula of Poenaru et al. (SemFIS), Scaling law of brown (SLB), scaling law of Horoi (SLH) and are compared with CPPM values and found to be in good agreement. A comparison of half-life for ground and excited systems reveals that probability of decay increases with a rise in temperature or otherwise, inclusion of excitation energy decreases the T1/2 values. We investigated the alpha and daughter preformation probability inside nuclei when the daughter and parent are of different spin and/or parity. Also, we apply a simple barrier penetration approach to calculate alpha-decay branching ratios to members of ground-state rotational band of heavy even-even nuclei. The inuence of alpha-decay energy, the angular momentum of α-particle, and the excitation probability of the daughter nucleus is taken into account in our calculations. The standard deviation compared for the half-lives with the experimental data.