Abstract: ANSYS Mechanical APDL finite element simulation and experimental method were used to study the influence of growth along the short edge and growth along the long edge on the temperature and deformation of the cuboid samples manufactured by laser coaxial powder feeding additive manufacturing.The results show that in the additive manufacturing process, the temperature of points on the substrate fluctuates periodically and goes through the rising, stable and falling stages.Under the mode of growing along the short edge, the maximum temperature of the points on the substrate is lower and the cooling rate is slower, and the temperature is higher at the end of additive manufacturing, but the cooling rate is faster during cooling; the maximum temperature of the molten pool of additive manufactured specimen is lower, the high temperature range of the sample is smaller, but the heat transferred to the substrate is larger, and the temperature value and distribution area of the substrate are larger than those growing along the long side.After additive manufacturing, the longitudinal warpage of the substrate facing the laser source mainly occurs, and the warpage of the substrate under growing along the short edge is bigger than that under growing along the long edge.