The high-stability femtosecond optical frequency comb adopts fully polarization-maintaining fiber femtosecond fiber seed source, low-noise femtosecond fiber amplification, high-speed phase-locked loop, repetition frequency intelligent locking and other technologies, which can automatically lock the repetition frequency with one click and never Lost lock. The unique cavity design ensures long-term stable operation of the laser in various environments. An electro-optical modulator can be added to the cavity to suppress high-frequency noise. The newly upgraded control system operates more stably and can meet the repetition frequency output of up to 500MHz; the unique intelligent locking system has AI independent learning capabilities, making it highly resistant to environmental interference. Under the radio frequency reference, the repetition frequency locking system Stability of 4E-14 seconds, stability of 10,000 seconds up to 2E-17, suitable for optical clocks, molecular spectroscopy, high-precision long-distance time and frequency transmission, high-precision measurement and other fields