Based on stability problems of underground super high water filling mining technology in practical use, stability of filling materials together with relation between mine pressure and filled body strength were analyzed from aspect of its compressive property. The result showed that compression would change to varying degrees according to different strength of filling materials when super high water filling materials was under constant pressure. The higher strength of filling was, the lower compression ration would be until it could be negligible, whereas, it would be greater. And decrement of filling would remain steady once it compressed to a certain degree.