The definition of bidirectional reflectance distribution function (BRDF) and the principle of measurment apparatus are expounded. Aluminum alloy materials are widely used in space camera. The BRDF data of aluminum alloy samples dealt with different processing technologies are scaled by the compact BRDF measurement system. Every error source of compact BRDF measurement system is analyzed, and the methods to control and correct these errors are proposed. Comparison among BRDF data of aluminum alloy samples dealt with different processing technologies is significative for the conceptual design of space camera.