For the hole type changing with laser process parameters, a two-dimensional transient finite model with characteristics of transmission and distribution of beam intensity for laser drilling is established. Numerical simulation research on the hole development is done. The model accounts for the spatial distribution of laser beam and the latent heat of materials phase transformation . The transient thermal field and interface evolution of the hole are showed in the computational analyses. The results show that the depth of the hole increases with the time of laser-material interaction, with the drilling velocity about 1 m/s magnitude, while the hole diameter changes little after the initial increase. The experimental results of various cross-section of the hole type in different parameters are compared with the simulation ones, and they are in good agreement. The hole types include cylindrical type, positive cone type, and inverted cone type. The numerical simulation method calculates the penetration holes and helps to choose appropriate laser parameters.