Abstract: At present, the user interface information of agricultural machinery is poor, the interface layout is unreasonable, the interface design does not conform to ergonomics, and the interface interaction is easy to cause the driver’s operation fatigue. The unreasonable interface design and layout will increase the driver’s cognitive deviation and operation error. The dynamic model of tractor is built by Rhino software, and the digital virtual driver is built by JACK software. The Rhino model is imported into JACK ergonomic software. The advantages and disadvantages are described and the experiment simulation is carried out. Through the study of the driver’s simulation and analysis of the visual domain, reachable domain and comfort of the agricultural machinery user interface, the traditional interface layout and existing human-computer interaction problems are obtained. On this basis, we optimize the design objectives and verify the reliability of our design. JACK software design is conducive to improve the accuracy, comfort and safety of the driver’s operation, reduce unnecessary experimental costs, and provide convenient reference for the user interface of agricultural machinery to be more humanized and rationalized.