A convection/diffusion single phase governing equation was employed to deal with heat transfer and fluid flow in solid, solid liquid and liquid phase system in a description of melting and solidification. A source term method was used to deal with changes of momentum and energy in respective governing equations. Based on commercial software Phoenics which is very useful in fluid flow and heat transfer, several modules were added. A 3 D transient temperature field and velocity field simulation program was developed and used to describe the laser cladding synthesis TiCp/Al composite material. A ZL104 specimen was taken as an example, to clad TiCP/Al composite by laser and to calculate the process with the developed program. Calculated results were basically coincident with those measured in the experiment.