Abstract: In order to analyze anchorage force reduction phenomenon when anchorage supporting roadway in surrounding rock with high water content,applying experimental and theoretical method to researching the influence of water on anchorage properties of resin bolt. Results showed that water dripping from roof and wall drill-holes had bigger influence on anchorage properties of resin bolt. Anchorage force reduced with roof dripping water and drill-hole water ratio increasing. When dripping water exceeded 600mL / min,anchorage force was only 10% of maximum value under dry environment. When drill-hole water ratio was larger than 49%,anchorage force was only 30% of maximum value under dry environment. On the basis of this,the influence of water on coal-rock body’ s mechanics properties and solidification action procedure of resin anchoring agent. The method of improving supporting effect by increasing water repellency of resin anchoring agent and prolonging anchoring length was put forward.