The header is an actuator of picking corn from maize straw. The conveyor is a device of delivering corn. They are both important parts of a corn harvester and can affect the performance of the machine. In consideration of the working characteristics of the header and conveyor, and giving full play to the advantages of hydraulic drive system, two kinds of hydraulic system for driving header and conveyor of corn harvester were designed and analyzed. They were valve control system and pump control system. Based on the analysis of the advantages and disadvantages of the two systems, the pump control hydraulic system was selected as the optimal scheme. The research provides theoretical basis for the design of power transmission system of the corn harvester.