Stability of new graphite uranyl sulfate intercalation compounds has been studied as a function of temperature and concentration. The action of uranyl sulfuric acid aqueous solution on graphite leads to the formation of two mixed phases of intercalation products : the usual sulfate phase (di=800 pm) and a uranyl sulfate phase (di=855 pm). The structure of uranyl sulfate phase has been characterized by X-ray diffraction. The electronic distribution pattern along the graphite c axis has been established with [001] reflections while [hk0] reflections has led to the determination of the planar primitive cell. A complete Raman microspetroscopic study has been done with pure uranyl sulfate graphite compounds from HOPG to stage 1. This technique has also displayed intercalated species.