Aiming at the application requirement of resonator fiber optic gyroscopes, a frequency tracking and lock-ing control scheme based on laser temperature and PZT control is proposed in this paper. By taking advantages ofthe large range of laser temperature tuning as well as the high precision and high dynamicity of PZT tuning, trackingof the fiber laser’s central frequency to the fiber ring resonator’s resonance frequency is realized. Typical transmis-sion resonant curve is simulated by mathematical methods. Hardware design, algorithm simulations of temperatureand PZT control scheme are carried out. The influence of control parameters on tracking stability is analyzed. Thedevelopment of laser frequency tracking systems is assembled. The high-precision and long-time tracking of laser’scentral frequency to resonance frequency is realized successfully. The locking precision is low to 4.8×10-9hour under room temperature. The locking precision is low to 9.74×10-8 over 5.5 hours under variable temperature. over oneThis work has laid an important foundation for improving the long-term performance of resonator fiber optic gyros-copes.