受热效应、光学损伤与非线性效应等因素的限制，单纤的功率提高困难。因此通过光学元件将多束激光进行合束的光束合成技术应运而生。光谱合束方案具有结构简单，合束光束质量好等优点，逐渐成为了合束技术发展的主流。简要介绍了光纤激光光谱合束的几种常见合束方案，对比分析了几种合束技术的优缺点。对光谱合束中存在的光栅热畸变问题，从理论研究和实验研究两个方面进行了针对性的分析与讨论，并对光谱合束未来的发展趋势进行了展望。

The output power of single fiber is limited by the thermal effects, laser damage threshold, and nonlinear optical effects. Beam combining technology has been proposed to break through the limit of single fiber and achieve higher output power fiber laser. Spectral beam combining technology has the advantages of good beam quality and simple structure, which stands out among many beam combining technologies. We review several typical kinds of spectral beam combining technologies of fiber lasers, including their principles, current status, advantages and disadvantages. The recent progress of thermal distortion of the grating was introduced and discussed from the aspects of theoretical and experimental research, and the development trend of spectral beam combining technology are prospected.