This paper proposes to use the millimeter wave radar system to detect, the developer uses the Texas Instruments IWR1642 in the 76 to 81 GHz band and the integrated single-chip millimeter wave sensor based on FMCW radar technology, hardware equipped with C674x DSP and millimeter wave radar. The user places the radar sensor development board on different heights of the base. In the detection range of 2-4 meters in length and width, the human body posture track is monitored for different heights, The effective space distance is detected and discussed. In recent years, the home care monitoring sensors are analyzed.