Abstract: To overcome the disadvantage features of passive millimeter wave imaging system, such as weak signal strength, poor imaging effect, slow speed and big size, a signal point active 35GHz MMW imaging system is implemented. The system costs 200s to scan a human body to be imaged, and the resolution of the system is 10. 5mm, the volume is less than 1. 5m3 as well. To improve the system, an array type millimeter wave imaging system solution was proposed. The speed of the system reached 38. 7 s, when the resolution is 3. 225cm. The active MMW imaging system scan effect is relatively ide al, and the knives on the human body can be recognized clearly.