Abstract: This paper proposes a new method to automatically detect the quality of ink-jet，describes architecture of the system，and represents design of the software.The system is based on high speed video capture device and image processing techniques.A microscope and a CCD camera are used to magnify and capture the flying ink drop images，a frequency generator and a two axis motor stage are applied as controlling unit.The system accomplishes automatic and real time capture of ink drop images.In the process of grapping images，the camera can be positioned accurately to each nozzle of the print-head.The captured images are analyzed with machine vision techniques，thus the visualization of ink-jet drops and the automatic detection of ink-jet quality are realized.