In order to analyze the velocity and temperature of moving metal particles in coaxial laser cladding, and to study the influence of process parameters, the movement model and thermal model of moving metal powder particle were proposed. The simulated results show that the nozzle geometric structure, particle size and initial velocity of the shield gas /powder two-phase flow are important parameters to affect movement behavior of the powder particles, and the nozzle geometric structure, position of laser beam focual point, divergent angle, laser power, particle size and initial velocity of the shield gas /powder two-phase flow are important parameters to affect thermal behavior of the powder particles. Under the same process parameters (the inner radius of nozzle exit r=2 mm, the nozzle angle α=60°, initial gas velocity v0=0.8 m/s), based on digital particle image velocimetry (DPIV), the movement model of 316L stainless steel powder particle was proved by experiment. Results show that the movement model is reliable, and it is an efficient tool to understand the movement behavior of metal powder particles in coaxial laser cladding, and the thermal model is also an important tool to analyze the temperature change of powder particles with different parameters.