Logging automation in forestry has become a trend to replace the original manual operation. The hydraulic system of combined logging harvester head was analyzed and designed by parameterization in this paper, and the system was optimized by using loadsensitive pump and multichannel valve technology. The rationality and reliability of the design was verified based on simulation and analysis of the AMEsim, which provided experience and data support for relevant product development and some design of loadsensitive system.