Design and experimental studies on the wavelength multiplexing and polarization multiplexing of diode laser arrays were carried out. First, the structure of a AlGaInAs/GaAs/AlGaAs quantum well under compressive strain was used because the characteristic of wavelength was easier to adjust. We obtained diode laser arrays lasing in five different wavelengths, about 760 nm, 800 nm, 860 nm, 930 nm, and 976 nm. At the same time, four edge filters were designed, and an experimental study on the beam multiplexing of diode laser arrays was carried out Second, two beams with different polarization states were composited using a half wave plate and a polarizing beam-splitter prism. After that, the beam focusing system was designed. Ultimately, ten beams of diode laser arrays in five wavelengths and two polarization states were composited, the total output power was 196 W and the overal efficiency was 76%. The size of the output focus spot was 144×1330μm2, and the power density of the focused light was as high as 1.02×105W/cm2. Compared with a single diode laser array, the power density of the composite beam was improved by 4.3 times. Design and experimental studies on the wavelength multiplexing and polarization multiplexing of diode laser arrays were carried out. First, the structure of a AlGaInAs / GaAs / AlGaAs quantum well under compressive strain was used because the characteristic of wavelength was easier to adjust. laser arrays lasing in five different wavelengths, about 760 nm, 800 nm, 860 nm, 930 nm, and 976 nm. The same time, four edge filters were designed, and an experimental study on the beam multiplexing of diode laser arrays was carried out of two beams with different polarization states were composited using a half wave plate and a polarizing beam-splitter prism. After that, the beam focusing system was designed. Ultimately, ten beams of diode laser arrays in five wavelengths and two polarization states were composited, the total output power was 196 W and the overal efficiency was 76%. The size of the output focus spot was 144 × 1330 μm2, and the power density of the focused li Compared with a single diode laser array, the power density of the composite beam was improved by 4.3 times.