Abstract: The exothermic dispersion method is used to study the dynamics mechanism CuO/Al reaction in-situ reinforced Al matrix composites. With the heat effect testing of CuO/Al reaction, the micro structural observing of materials and the mechanism analysis of the reaction process, a dynamics model of the compounding reaction is set up. The analysis illustrates that to increase the reaction temperature of the system and the content of aluminum will be beneficial to the reaction processing of forming Al₂O₃. The diffusion rate of Cu has a great influence on the reaction rate. Increasing the temperature and decreasing the thickness of the reaction film can increase the diffusion rate. The well-distributed Al₂O₃ in composite can be obtained. The higher the temperature, the longer the time, and the lower the viscosity of the medium, the smaller the size of particles, the more beneficial to the distribution of particles. Since Al₂O₃ is a phase with a higher melting point and because of the existence of CuAl₂, most of the Al₂O₃ is distributed in the crystal boundary.