The key technology of immersion virtual maintenance and training system includes model establishment, collision detection, virtual human control, program control realization, and view drive control.

The way of data transfer in DMA mode, control method of logical programmable device and design of driver program are discussed to solve the key point of sequential transmission.

Application of a temperature control device in the drying process of grain was studied to present the principle and the method of the system and introduce the method to program the key software.