Fluid dynamics characteristics of flow through copper foam are very important to its heat transfer performance influence. In order to use the heat transfer performance of copper foam well, Effects of pore density and porosity of copper foam on air pressure drop, on the permeability and inertia coefficient, on the Reynolds number,and the Relationship between Reynolds number and friction factor for air flow though copper foam were studied. Experimental results show that the pressure drop through copper foam increases as pore density increases, but decreases as porosity increases; the permeability through copper foam decreases as pore density increases and increases as porosity increases; the inertia coefficient decreases with the pore density increasing, the change in porosity has little effect on the inertia coefficient; the friction factor increases as Reynolds number increases before 15 to 20.