A kind of dolostone with "grape-lace shaped" cement is present in Upper Sinian Dengying Formation in Sichuan Basin.Because it is widely distributed in lateral but limited only in the middle-lower part of Member 2 in longitudinal,it can be deemed as an identification mark for outcrops and rock cores.Based on macroscopic and microscopic characteristics in lithologic samples,this kind of rock,which is defined as "grape-lace shaped"dolostone,is comprised of three textures in microphotograph,i.e.surrounding rock,"grape-lace shaped" lamina and dolosparite.The origin of cement in this dolostone is analyzed and described.