Abstract: The recent progress in the researches on semiconductor photocatalysis was surveyed, and some existed problems in the currentstudy and the future trend of developmentwere briefly analyzed. The main achievements in the studies of photocatalysis during the recent three decadeswere particularized, including the preparation of photocatalyst (exploita-tion of novel catalyst, and the modifications to TiO2, ZnO and CdS etc.), mechanism of photocatalytic process, engineering design of photocatalytic reaction, research and development of the products based on photocatalytic principle. Photocatalytic, in the mass, is a nonselective chemical process, so it is no longer importantto redoing a great deal of examination of photocatalytic activity for different reactants. In fact, some repeated reports on the semiconductor photocatalytic phenomena, and explanations of the mechanismwithuot or lack of experiment support have been frequently found in the publications. It is suggested that attention of the future investigation on the semiconductor photocatalysis should focus on the four aspects as followed, i.e. profound comprehension for photocatalytic mechanism, synthesis or preparation of novel photocatalystwith wide response to light and high photo quantum efficiency, engineering of photocatalytic reaction, and developing of newtype photocatalytic products.