A new kind of irregularly-shaped hole leading flow structure was proposed for solving the inhomogeneous distribution of fluid among different layers at the inlet of the exchanger.With the goal of flow uniformity and considering the difference of flow velocity at different positions at the inlet of the heat exchanger,a variable hole diversion irregularly-shaped leading flow structure was designed by collecting the fluid velocity vector near the key control points.The internal fluid flow and heat transfer of the irregularly-shaped leading flow structure plate-fin heat exchanger were analyzed,the numerical simulations of the heat exchanger flow field and the temperature field were carried out,and the fluid flow field and temperature distribution rule were obtained and compared with the traditional diversion structure.The results show that the irregularly-shaped hole leading flow structure can increase the fluid uniform distribution degree in the heat exchanger,which leads to the increase of the heat pressure ratio in the process of heat transfer;by using the irregularly-shaped hole diversion structure,the uniform distribution of the fluid can be improved and the impact can be reduced to a certain extent,while through the reasonable optimization and layout of the irregularly-shaped structure,the uniform distribution of the fluid at the heat exchanger inlet position and the heat transfer performance of the heat exchanger can be improved.