On the basis of mesostructure features, microbial carbonates could be subdivided into four common types: the laminated stromatolite, the clotted thrombolites, the structureless leiolites, and the dendritic dendrolite. Within this classification, the leiolite is defined as a relatively structureless and aphanitic mesostructure, which can be used as a synonym for “cryptomicrobial” and further grouped into the thrombolite. The strata of the Cambrian Furongian include the Changshan and the Fengshan Formations, in which can be discerned 3 thirdorder depositional sequences that are marked by the drowning unconformity. Many carbonate bioherms dominated by microbial carbonates are centralized distributed within the forced regressive system tract of these depositional sequences, and the Furongian at the Qijiayu Section in Laiyuan county of Hebei province is a typical example. At this section, two sets of bioherm limestones make up a grand sedimentological phynamenon, within which lots of nonhomogenous microscopic fabrics are strongly contrasting with the structureless megascopic feature of the leiolite, and characterized the leiolite: ① the fossil of calcified cyanobacterias such as the Hedstroemia, the Girvanella, and the special fossil of calcified filamental cyanobacterias that can bear an analogy to the modern Tychonema; ② the benthic ooid; ③ the residue of the Renalcid–like calcified biofilms; ④ the sponge mummy; ⑤ the burrow filled by benthic ooids; ⑥ the microstromatolite coating both the sponge mummy and the burrow. All of these microscopic features demonstrate that the Furongian leiolites at the Qijiayu Section might be resulted from the sophisticated calcification of extracellular polymerized substances (EPSs) that make up both the microbial mat and the microbial biofilm. Since no examples of modern leiolite have been published as well as few certain examples have been discerned in ancient stratigraphical records, carbonate bioherms dominated by the leiolite at the Qijiayu Section provide an example for the further understanding of the complex mechanism of the Cambrian leiolite.