The geometrical parameters of printed circuit heat exchanger (PCHE) have a significant influence on the heat transfer characteristics of the heat exchanger. It is of great significance to investigate the influence of forced convection characteristics in trapeze channel PCHE for the design and optimization of heat exchanger. Trapezoidal channel has better performance in heat transfer, better heat transfer efficiency and better heat transfer performance. Through numerical simulation, we mainly start from the printed circuit heat exchanger of trapezed section channel, and explore the influence on the performance of heat exchanger when the bending Angle of the channel is 0°, 10°, 20°, 30°, and the channel pitch is 8mm, 12mm, 16mm. When the fluid flows through the bending Angle, the flow state of the fluid will change. The fluid turbulence kinetic energy increases, the flow speed slows down, and the heat exchange performance of hot and cold channels improves. The results show that the heat exchanger has better performance when the bending Angle is 30° and the channel pitch is 8mm. Therefore, it is of great practical significance to study the influence of geometric parameters on heat transfer and heat transfer characteristics in PCHE and to analyze the flow heat transfer model for the design and optimization of heat exchangers.