It is contributed to reveal the combustion consistent mechanism of ammonium perchorate and hydroxyl-terminated pdybutadiene (AP/HTPB) composite propellant by studying its characteristics of ignition and combustion based on experiment. The firing efficiency of base bleed projectile will increase by improving combustion characteristic. Laser has the advantages of adjustable energy and high output stability, so it is the best energy source for energetic materials ignition and combustion test. The ignition delay time of AP/HTPB composite propellant samples is researched by using high power solid-state laser and high speed video system. The ignition delay time is dramaticlly shortened with laser intensity increasing and then tends to be gentle. The combustion speed is calculated as 3.41 mm/s based on combustion ordinal images and image processing technology. Numerical simulations of ignition and combustion of the test samples are conducted by building the one-dimensional laser ignition model for energetic materials. The calculated results of ignition delay time are in accordance with the test greatly, and the temperature variation with time and intensity is obtained.