Abstract: Focusing on the 11 IGS reference stations inside China, this paper selects the coordinate time series of these stations during period of 1995~2010 under ITRF2005, implements noise analysis on them using different noise model combination, meanwhile calculates impacts of different surface mass loadings on station displacement, such as atmospheric pressure loading, nontidal ocean loading snow depth and soil moisture loading, thus yields optimal noise models of different station components before and after surface mass loading correction. We draw conclusion that noise model of IGS stations inside China represent diversity characteristics with different noise feature among different components, mainly behaving as flicker noise plus white noise model and band pass plus power law plus white noise model. Other complicated noise models also account for a certain proportion, which is different from the existing results. Based on these, we quantitatively analyze the relationship among noise model, surface mass loading together with station’s linear velocity and its uncertainty respectively, finding that different complicated noise model would influence station’s linear velocity and its uncertainty with maximum discrepancy larger than 1mm/year. Besides, the calculated four kinds of surface mass loading could introduce noise changes mainly representing as band pass and random walk characteristics. Results of this paper could provide more accurate data for crustal movement investigation, meanwhile providing reference for coordinate time series analysis of continuously operating reference stations in China.