Photodissociation of Fe(CO)5 have been achieved using U-V laser as the photolysis source, A middle- energy U-V laser pulse (～20 mJ/pulse) is directed into a specially designed gas cell which typically contains 10-20 Torr of Fe(CO)5. We have obtained some ultrafine powders from U-V laser photolys of lron-pentacarbonyl in gas cell. Through the analysis of products by using modern physical instruments, we identify that the resulting powders are iron oxide, ironcarbide; they also contain a little crystalline state of iron or carbon and oxygen. The particles in the powders are uniform in size (300-400 ?) and have catalytical activity. At appropriate laser power densities, U-V laser photodecomposition of Fe(CO)5 has also-achieved to produce Fe film on the window of the gas cell. The film composition was examined by X-ray fluorescence.