The Early Triassic is a highly anomalous period in earth history, but little attention was given to this period in comparison with the Permian-Triassic boundary. The evolution of carbon and strontium isotopes of marine carbonate can give the information about the ecosystem function and environment change of the transitional period. According to the data concerning carbon and strontium isotopes during Early Triassic obtained from eastern Sichuan area, the isotope scattergram can be drawn, with which we can analyze the geological processes as well as the controlling factors. As shown by the scattergram, strontium isotope evolution curve increases monotonously, which is in high consistency with features of other areas in the world, suggesting that the increased content of highly radiogenic strontium was the leading factor for this phenomenon. In the carbon isotope scattergram, there exists violent fluctuation, which can be attributed to the migration of a large quantity of phosphate into the ocean which caused the blooming of the algae and the enhancement of the ocean primary productivity. The absorption and release of methane hydrate were not the main factors causing the fluctuation, whereas the persistent effects, such as the sea water reversion, can well explain the anomalous curve. Nevertheless, the mechanism should be further investigated. In addition, it is necessary to combine the organic carbon with the inorganic carbon and to consider the Early Cambrian.