As an important component of the hydraulic system of hilly and mountainous tractor，hydraulic integrated blocks can reduce the number of connecting pipes between hydraulic components，and are of great significance in solving the problem of oil leakage caused by oil pipe connections. In this paper，a hydraulic integrated block for attitude adjustment of the suspension system was designed according to the performance requirements of the electro.hydraulic suspension system for hilly and mountainous tractor， the main structural parameters were designed and calculated， meanwhile， a three.dimensional model of the hydraulic integrated block was established. The internal flow channel structure of the hydraulic integrated block was optimized based on the single.objective optimization results of the tool tip angle，process holes，and non.orthogonal channel，the response surface analysis of the combined flow channel，the CFD analysis of the overall flow channel，and the fluid.solid coupling analysis. Finally，the CFD simulation and fluid.solid coupling simulation are used to compare the performance before and after optimization. The simulation results showed that：after optimization， the pressure loss of the inlet and return channels of the lateral attitude adjustment of the oil supply to port A is reduced by 0. 005 MPa and 0. 013 MPa，respectively，compared with that before optimization. The pressure loss of the inlet and return channels of the lateral attitude adjustment of the oil supply to port B is reduced by 0. 048 MPa and 0. 015 MPa，respectively. The pressure losses in the inlet and return channels of the lifting circuit decreased by 0. 129 MPa and 0. 003 MPa，respectively，which verified the superiority of optimized hydraulic integrated block.

"> hilly and mountainous areas, tractors, electro.hydraulic suspension system, hydraulic manifold block, CFD , simulation, structural optimization ,

液压集成阀块作为丘陵山地拖拉机液压系统的重要组成部分，可减少液压元件之间连接管的数量，对解决因油管连接而引起的油液泄露问题具有重要意义。针对丘陵山地拖拉机电液悬挂系统工作性能要求，设计一组用于悬挂系统姿态调节的液压集成阀块，对其主要结构参数进行设计计算，建立液压集成阀块三维模型。根据刀尖角、工艺孔、非正交流道单目标优化结果，组合流道响应面分析结果、整体流道 CFD分析结果和流固耦合分析结果，对液压集成块内部流道结构进行优化设计。最后，通过 CFD仿真与流固耦合仿真对比优化前后性能。仿真结果表明：优化后的 A口供油横向姿态调节进油流道和回油流道压力损失相比于优化前分别减小 0. 005 MPa、0. 013 MPa，B口供油横向姿态调节进油流道和回油流道压力损失相比于优化前分别减小 0. 048 MPa、0. 015 MPa，升降回路进油流道和回油流道压力损失相比于优化前分别减小 0. 129 MPa、0. 003 MPa，验证优化后阀块性能的优越性。