Abstract: Ghost imaging has attracted a great deal of attentions due to it's nonlocal characteristic and imaging resolution breaking the limitation of diffraction. A study about the relationship between the pure phase object ghost imaging and the fluctuation of the source was reported. That the intensity fluctuations of the source can affect the information of the pure phase object which we get from the ghost image was demonstrated theoretically and experimentally: the more severely the intensity of the source fluctuates, the more information of the pure phase object we can recover from the ghost image. Moreover, the increase of the intensity fluctuations could lead to the growing deviation of the object information of ghost images which obtained from different samples.