To meet the urgent needs of high-precision guidance, navigation and control systems in space and other fields, the research of interferometer photonic crystal fiber optic gyroscope (PCFOG) based on solid core polarization maintaining photonic crystal fiber (PM-PCFs) is carried out. Some key technologies, such as the fabrication technology of PM-PCFs and erbium-doped PCFs (ED-PCFs) for PCFOG, the coupling technology and the fusion technology of PCFs, are studied and developed. The prototype of PCFOG is developed and the typical environmental tests are carried out. The results show that PCFOG has obvious advantages in accuracy and environmental adaptability, and satisfies the conditions of engineering application.