高重复频率光纤激光器因其光斑质量好、集成化程度高、光光转化率高等优势在光学频率梳、工业加工、超高速光学采样等领域有着举足轻重的作用。利用非线性偏振旋转（NPR）的锁模机理，设计并搭建了一款基础重复频率为163 MHz的“十字腔”型孤子锁模光纤飞秒激光器。该激光器锁模后在450 mW的泵浦功率下可以输出200 mW的最大功率，光谱半高宽为30 nm，输出脉宽为786 fs。通过进一步分析激光器泵浦功率与输出功率之间的关系，得到泵浦功率处于400～500 mW时，激光器处于最佳锁模状态，并且可以实现自启动锁模。所设计的激光器由于其更加紧密的光学频率梳齿、更好的成像质量和更快的成像速度，在精密光谱、天文探测等领域具有应用意义。

High repetition frequency fiber laser plays an important role in the optical frequency comb, industrial processing, ultra-high speed optical sampling and other fields due to its advantages of good beam quality, low power consumption, and high integration. A 163 MHz fundamental repetition rate soliton mode-locked fiber femtosecond laser oscillator is designed and constructed based on nonlinear polarization rotation (NPR) technique. The laser can produce a maximum power of 200 mW at a pump power of 450 mW, with a 30 nm bandwidth and a 786 fs output pulse width duration. By further analyzing the relationship between the pumping power and the output power, it is found that the best operation condition for the laser is at 400～450 mW for the pump power. At the same times, the laser can realize self-starting mode-locking. The proposed laser is of great potential in the application fields like precision spectroscopy and astronomical exploration because of its compact optical frequency comb, high image quality and high imaging speed.