Based on meteorological data from island automatic weather stations (AWS), oil platforms, buoy observation stations and shipboard AWS, an objective estimation method of improving TC (tropical cyclone) intensity analysis over the South China Sea is discussed. The tropical intensity of 18 tropical cyclones from 2013 to 2016 has been analyzed using that objective method. The results show that the averaged estimation errors using that method are at the same level with those based on atmospheric satellites. Meanwhile, the estimation is related to the TC intensity itself and the number of valid observation samples. Whether there are observation samples located inside the maximum wind radius can also influence the estimated outcomes. In the case of inconsistent intensity analysis, the use of oceanbased observation can serve as a supplemental method in TC intensity analysis.