Energy and Power Spectra of Circinus X-1 in the Crisis

Cir X-1 is a low mass X-ray binary (LMXB). The color-color diagram and the hardness intensity diagram (HID) are showed by dissimilar figures in different periods. We use the transformation period in which the X-ray flow of Cir X-1 changes from high to low to discuss the HID by the corresponding energy spectra and timing characters, and we also compare the results in 1977. We have found new effect on the X-ray radiation with intensity changes of the source.