Recently, high technology industry is rising. IC process technology is advancing and consumable 3C electronic product towards light、thin、short and small, for example, digital VCD、 digital camera and digital V8. The key technology is to put the micro-optical device into the micro system. For example, diffractive optic elements can take the special function for traditional optical device, and it has many advantages for small volume、light weight、dense structure、mass production and low cost. So, the future optical system is toward light、 micro and bulk. One of the methods to manufacture micro optical device is to apply the IC process. In this text we will delicate discuss about the IC process applied in manufacture optical device process.