Abstract: In order to solve the issue of uneven cooling of square tube aluminum profiles,three-dimensional transient numerical simulation for the temperature field of a square tube aluminum profile in spray cooling was carried out by the finite element analysis software Fluent.The change in temperature field at characteristic points in the square tube aluminum profile was analyzed.The influence of extrusion velocity,nozzle vertical separation distance and nozzle horizontal separation distance on the temperature field was researched.The results show that extrusion velocity and nozzle vertical separation distance have a great influence on the temperature field in the vertical direction;and nozzle horizontal separation distance has a great influence on the temperature field in the horizontal direction.With the maximum extrusion speed,minimum nozzle vertical separation distance and a nozzle horizontal separation distance of 80 mm,the temperature field of spray cooling can be more uniform.