Abstract: The experiments on the premixed natural gas combustion and heat transfer were conducted in a bench-scale porous media burner. The porous media used is a kind of gradually-varied porous media. It is found that the premixed natural gas can burn steadily in the burner, and gas velocity and porous media thickness have influences on the temperature profile, exit gas temperature and pressure drop. Heat transfer coefficient between the flame and water in the jacket was measured. Experimental results show that the heat transfer is enhanced in the gradually-varied porous media, comparing to the free flame combustion. Meanwhile, a pressure drop along the burner increases as the gas velocity and porous media thickness increase.