Since the invention of the diode laser, it has been widely used in various fields by virtue of its advantages such as high stability, high photoelectric conversion efficiency and small size. However, due to the large difference in beam quality between the fast axis and the slow axis, it cannot be directly applied. Dense beam wavelength combining technology is used as a method to increase power and ensure the quality of laser beams. The light source based on two packaging forms of single emitter diode laser and diode laser bar is discussed. The development status of dense beam wavelength combining technology of high power, high beam quality diode lasers at home and abroad is introduced. The technical characteristics of beam combining are discussed. And the development trend is forecasted.