Abstract: Abundant microbially induced sedimentary structures (MISS) are well preserved in the Ruyang Group in Lushan, western Henan. Two types of the sedimentary structures are identified, including the mesh-shaped and fusular structures. The relationship between the microbially induced sedimentary structures and sedimentary enviromnents indicates that the evolution of the microbially induced sedimentary structures coincides with that of the sedimentary environments in the study area. In addition, there is also close relations between the morphology of the microbially induced sedimentary structures, and the thickness and exposure frequency of the microbial mats.