Abstract: Using cationic polymerization method, the photoactive polyether ( PGMA ) was synthesized by 1,3-propanediol reacted with glycidyl methacrylate at presence of tin tetrachloride and trifluoroacetic acid as catalyst. The photoactive polyether was composed of the main chain of C-O-C band and comb-like side chain (glycidyl methacrylate), terminated by hydroxyl. The as-prepared PGMA reacted with isophorone diisocyanate to form the photoactive polyurethane (poly(PGMA-IPDI)). Finaly, adding active diluent and photoinitiator into poly(PGMA-IPDI) can produce a kind of UV resin, which exhibited the ability of rapid curing and excellent properties, such as flexibility, adhesion, water resistance, salt resistance, alkali resistance and high curing speed up to one second.