Abstract: Additional material manufacturing technology overcomes the limitations of traditional manifold block processing methods with its unique advantages, and provides a new solution for manifold block processing. In this paper, the channel structures of traditional technology, oblique channel and spline curve are established, and the fluid pressure distribution, velocity distribution and turbulent energy of three internal channel structures are simulated by fluent fluid analysis software. The results show that the pressure distribution of liquid flow in oblique channel and spline curve channel structures is the same. The turbulence energy of the channel structure with spline curve is less than that of the traditional process channel and oblique channel, and the relative fluidity performance is better.