Baoshan area, located in the northern margin of Gondwanaland in the late Silurian, exhibits different paleoclimate and paleomarine environment characteristics from those of the South China, Tarim and North China blocks. The 3rd Member of the Silurian Lichaiba Formation is of Pridoli age. Based on the study of sedimentary characteristics of carbonate rocks, supplemented by regional geological background, paleontological data, sedimentary facies, element content and ratios, carbon and oxygen isotope data, the paleomarine environment is discussed. The results show that: (1) by referring to Wilson’s standard microfacies sedimentary model and combining it with lithologic characteristics, six microfacies types, i. e.RMF8, RMF10, RMF11, RMF16, RMF20 and RMF23, can be identified; (2) the carbon isotopes show three significant positive excursions, one in the middle- late Ludford, second during the late Pridorian, and the last in the Silurian- Devonian boundary, all of which are globally comparable, corresponding respectively to the “Lau” Event, the late Pridolian positive excursion Event and the “Klonk” Event in Europe or America. However, the degree of excursions is different in different regions; (3) based on the analysis of carbon and oxygen isotopes, the variation in salinity and temperature of the ancient seawater are reconstructed, showing that the salinity index value Z range from 120 to 130, the temperatures between 17. 03~28. 85 ℃, and most of them are above 20 ℃, indicating a warm or hot subtropical marine climate for the studied area; (4) an element geochemical analysis, mainly using the information from B, Ni, V and Ti and the ratios of Mn/Fe, V/(V+Ni) and MgO/Cao, was conducted. The results show that two obvious increases of material supply from land coincide with the time intervals after two carbon isotope excursions. This phenomenon is due to the increasing exposure of ancient land under the influence of orogeny, which supplies more terrestrial material to the ocean. The V/(V+Ni) ratios in the studied interval, mostly within the range of 0. 57~0. 83, represent a reduction environment with sluggish water circulation, and are consistent with the lithological and sedimentary faciescharacteristics; (5) It is concluded that the three positive carbon isotope excursion events were a response to the large- scale regression against the background of Caledonian orogeny in the late Silurian. The petrological, microfacies and geochemical characteristics of carbonate rocks show that the paleomarine environment is associated with tectonic events.