Boom hydraulic system is an important part of concrete pump truck,which is used to transport concrete and distribute material.At present,there is the problem of excessive pressure loss.With the help of AMESim and Simcenter 3D Montion software,the virtual prototype model of 62 m pump truck boom was established.The experimental result shows that the virtual prototype has more than 90% consistency with the actual system.The dynamic characteristics of the system were studied by using the boom virtual prototype,the pressure distribution of the system was revealed,the reasons for high system pressure loss was analyzed.The main pressure loss was concentrated in the balance valve and long hydraulic pipelines.Three solutions were proposed to reduce pressure loss.Taking the optimization of boom pipe diameter as an example,the simulation analysis and optimization were carried out,and the optimization effect of pipe diameter was verified by experiments.According to simulation and experimental results,it can be concluded that under the condition of five arm hook retraction,increasing the diameter of the long pipeline of the boom from 8 mm to 10 mm can reduce the pressure loss of the small cavity side pipeline by 50% and the large cavity side pipeline by 60%,effectively reducing the system pressure.