Abstract: In this work, the photochemical behaviors of some novel Thioxanthone compounds have been studied. The photochemical problems of these compounds incorporateing with iodonium salts and amine for using as a photosensitive composition have also been investigated. Experimental results indicated that the studied photochemical reactions possess evident character of electron transfer. In addition, the obtained kinetic constants are valuable to understand the suitable region for the application of these photosensitization initiation systems.