Abstract: This text simulates the scattering rays from the industry CT get through the material through an experiment. This experiment used a high intension source 60Co and a small bulk but high efficiency CdZnTe detector, through 24 hours measuring and matlab calculating, the results showed that rays had a high energy aggradations between 0-2 degrees from the collimation direction after the rays was collimated, then the energy aggradations decreased quickly as the angle increasesd, it shows that one should think about the aggradations affection between 0-2 degrees when design and select the detector rays.