The photosolubilization of crosslinked polyvinyl alcohol with titanium citrate, tartarate and lactate has been investigated. Alkyltitanates and those titanium complexes are known to crosslink a polymer containing -OH, -000H and -NH groups. In these crosslinking agents, the alkyltitanates are very active and are easily hydrolyzed on exposure to water or wet air, whereas the titanium complexes are less active and water-soluble. The solubility of crosslinked polymers with the titanium complexes such as polyvinyl alcohol, gelatin, polyacrylamide, polyacrylic acid and cellulose derivatives increased with exposure to a ultraviolet light. It is suggested that the increase of the solubility is due to the degradation of crosslink which is accompanyed with the photoreduction from Ti (IV) to Ti (III). The photo-solubilizing property of the crosslinked polymers with titanium complexes may be used as a photoresist.