FMC series high-power multimode continuous wave fiber laser is developed and produced by Beijing Reci Laser Technology co., Ltd. The average output power ranges from 4000W ~ 15000W, with modular design, high system integration, good environmental stability, long lifespan and maintenance-free operation. The series products can be widely used in metal cutting, metal welding, surface treatment, 3D printing and rapid prototyping, due to the high average power, multiple anti-high-reflection, and high electro-optic conversion efficiency. Especially, the cutting speed is fast, and the slits are bright while cutting the thick metal plate, which has obvious advantages compared with other similar lasers on the market.