The core component of the micro Raman spectrometer is its spectroscopic chip. It has the important meaning to develope the new spectroscopic chip the micro Raman spectrometer with microminiaturization, high machining accuracy and low cost. This work can help us to break the current foreign technology patent blockade and obtain intellectual property rights of our own country. Arrayed waveguide grating is originally used in the optical communication field. It is a new thought to arrayed waveguide grating as the spectroscopic chip for the micro Raman spectrometer. Arrayed waveguide grating has the advantages of small size, high precision, simple processing, and easy to mass production. The research progress on arrayed waveguide grating chip for micro Raman spectrometer at home and abroad is described and the corresponding analysis is made. In addition, an improved method is proposed for arrayed waveguide grating used for spectroscopic chip.