This paper presents a design of projector lift control based on dual processor atmega8 and stm32f101 and introduces its circuit composition, function and software processor. In the design, stm32f101 is responsible for motor control, and Atmega8 is responsible for data collection. The processors communicate through the I2C bus. The system uses an infrared remote control or external keystroke, or it can also use pc-on-line. The test verifies that the design is proper and effective and its fixed-point accuracy meets the practical requirement.