In laser coaxial cladding,laser casing qualities are directly affected by temperature field of powder flow for the interaction between laser and powers.According to the model of non-premixed combustion,regarding laser beam as continuity medium phase and powder as disperse medium phase,the conservation equations of mass,momentum and energy are established in laser and powder flow.Computer simulations of temperature field in different parameters are finished using Fluent software.Some effects of laser cladding parameters on temperature distribution such as laser power and powder flow velocity are discussed.Temperature field distribution in the powder flow is measured by CCD camera.It is shown that simulation and experimental results agree well,numerical simulation of temperature field in powder flow is important for laser cladding.