Abstract: In the Sino-Russian joint Z-pinch experiments on Angara-5-1 facility, the framing camera with an exposure time of several 10 picosecond was employed. By setting different kinds of filters of various thickness values before the pinholes of camera and using the spectral sensitivity of the camera, multi-frame X-ray images of wire arrays Z-pinch implosions in different energy ranges were obtained. By analysing the relationship between the intensity profiles of corresponding frames and the spectral sensitivity of the camera, it is allowed to estimate X-ray photon energy range in local areas of images. And it is determined that the spectral sensitity of the picosencond-frame camera belongs to a range from 70 eV(without 2.3 mm formvar filter) and from 150 eV(with 2.3 mm formvar filter).