Graphite carbon nitride（g-C₃N₄）,as a metal-free photocatalyst,has attracted much attention due to its low cost, easy availability and good photoresponse characteristics.However,the high recombination rate of electron-hole pairs hinders its wide application.Herein,using melamine as raw material and urea as a porogen,porous g-C₃N₄ nanosheets（PCNS）was prepared by the hydrothermal combined calcination method.Chemical reduction method was used to load Au on the surface of PCNS,and the Au content in the reaction system was also adjusted.The composites were characterized by X-ray diffraction （XRD）,infrared spectroscopy（FT-IR）,Raman spectroscopy（Raman）,transmission electron microscopy （TEM）,ultraviolet visible diffuse reflectance spectroscopy（UV-Vis DRS） and electrochemical tests.In comparison with PCNS,Au/PCNS co-mposite not only had stronger light absorption performance,but the recombination rate of electrons and holes was also signi-ficantly reduced.At the same time,the hydrogen production performance of composite under visible light was studied,and it was found that 0.5%Au/PCNS showed the best photocatalytic hydrogen production rate[84.09 μmol/（g·h）],which was 44.7 times of 0.5%Au/g-C₃N₄[1.88 μmol/（g·h）].