In different ages， due to difference in burial depth and in oxidation-reduction conditions of diagenetic environments， the cements precipitated are different in character. In some cases, precipitation of cements of different generations is continuous, and the contact between two generations of cements is conformable. But in other cases, precipitation process is once interrupted by dissolution, and the contact between two generations of cements is unconformable. Some pores and fissures form early, and generations of cements in them are many and complete. But some pores and fissures form late, and some generations of cements are missing. Thus, cements can also be divided and correlated like strata. Thereby, change of diagenetic environments can be analyzed, and time of pore and fissure formation can be inferred. As change of diagenetic environments is commonly related with structural movements, time of structural movement can also be inferred through study of cement stratigraphy. In  Ordovician carbonate rocks of the Qianmiqiao area of the Huanghua Depression, pores and fissures are filled with 5 generations of cements. Each generation shows different color of cathodoluminescence. Between the second and third generations of cements there exists dissolution unconformity. Based on characteristics of cements, 5 times of fracturing can be recognized, which occurred in the Triassic, middle-late Cretaceous, end of Paleogene and end of Neogene.