With the continuous development of the existing society,the demand for photodetector is increasing,but the development of existing traditional material detectors has entered a bottleneck period. There is an urgent need for the emergence of new materials to further develop photodetectors. New two dimensional material photodetector such as graphene has atomic size,adjustable energy band,flexibility and other excellent characteristics. They can meet the existing high demand of the performance and size of the photodetector in society today. Therefore,two dimensional material photodetectors have been widely studied and achieved fruitful research results. However,with obvious advantages,two dimansional materials also have some obvious disadvantages. That would limit their using in more areas and some means are needed to improve and optimize the performance of the detector. This paper focuses on the research progress of the existing two dimensional photodetector and introduces how to improve the performance of the detector by means of light field enhancement,so as to provide reference for relevant personnel.