In order to meet the requirements of co-packaged optics (CPO) system, a multi-quantum well (MQW) continuous wave (CW) high-power distributed feedback (DFB) laser with high power, low noise and low loss is designed with the wavelength of 1310nm. There is a specially optimized far-field reduction layer (FRL) below the MQW active layers to pull optical mode into the lower n-cladding layers. This design can reduce the internal loss of waveguide and the optical confinement factor. The fabricated DFB laser exhibits high slope efficiency and enables uncooled CW operation at high ambient temperatures. Test results indicate that the output power, threshold current and slope efficiency of the DFB laser are achieved to 173mW@400mA, 20mA and 0.46mW/mA at 25℃, respectively. When the injection current is 300mA, the far-field patterns divergence angle is 15.2°×19.1°, the sidemode suppression ratio (SMSR) is higher than 55dB, the relative intensity noise (RIN) of laser is less than -155dB/Hz, and the Lorentz linewidth is less than 600kHz. The output power and the threshold current of the DFB are achieved to 112mW@400mA and 32mA at 85℃, respectively.