The flow behavior of metal powder determines the quality and performance of molded parts, which is influenced by many factors such as powder properties, process parameters and nozzle structure. In order to improve the quality and performance of aluminum alloy powder laser clad molded parts, this paper introduces the research progress on the flow behavior of metal powder, and study the influencing factors such as powder properties, nozzle structure, process parameters, laser-powder coupling, coating layer structure, etc.; then compare with the material properties of aluminum alloy powder, summarize the research progress on the optimization of aluminum alloy powder flow behavior, and propose the laws and methods to improve the flow behavior of aluminum alloy powder. Finally, the existing problems and future research directions of aluminum alloy powder in the field of metal laser cladding are summarized and prospected. The research results are of great significance for improving the flow properties of aluminum alloy powder and promoting the application of metal powder in the field of laser cladding.