Abstract: With the development of the optical communication and optical information,laser reflective mirror and ITF filter is catching people's attention. With the further development in this field, the organic optical film filters and devices will be laid stress on increasingly. And a excellent narrow-band filter will be produced with a low-pass and a high-pass filter at the passband congruence. In this paper several optical thin film devices such as laser reflective mirror,ITF filter, microchip laser are introducted and their fabricated process as well as design method are given, which is very useful in the optical application field.