Baggage scanners are mainly used for detection of harmful objects in the briefcase, backpack, small packages and mail, which has good effect for the prohibited item.Baggage scanner is to use X-ray through the object to distinguish objects. As the situation changes, baggage scanner also has many improvements that are made in different ways to make its performance greatly increased. This device is suitable for using in a human body safety inspection. It can also use two probes before and after the plateau z material with low atomic number material detected respectively. Through the proper image processing, it can obtain high resolution image. This device is applicable to the luggage check, large car flow check and large truck inspection system.