Based on the tested data of pressure and vitrinite reflectance of some wells in sedimentary basin, the abnormal high pressure is not the only factor to retard the increase of vitrinite reflectance(R_o). Besides the types of the organic matter, the physical environment(temperature and pressure) and chemical environment(fluid composition and inorganic elements) will result in the abnormal vitrinite reflectance values in the sedimentary basins. This paper tested trace elements and vitrinite reflectance data from the the abnormal high pressure and normal pressure strata profiles repectively, and the contents of some kinds of trace elements in the mudstone are related well with the vitrinite reflectance values. The acidic and lower salinity starta is favorable to the increase of R_o. The typical trace elements, which may suppress and/or catalyze the vitrinite reflectance of organic matter, are determined qualitatively in this research work. The elements of Ca, Mn, Sr, B, Ba and P may result in the retardation of R_o. However, elements of Fe, Co, Zn, Ni and Rb may catalyze the organic matter maturation.This study will benefit the organic maturation correction, oil and gas assessment and thermal history reconstruction by the paleothermometry.