Proceeding of the Joint International Symposium on Deformatuon Monitoring. 2-4 November, 2011. Hong Kong. China. Report. BERNESE 5.0 Software was adopted in this paper to calculate the data observed by TJCORS of 2007-2009 in Tianjin region to obtain the reference station coordinate time series. The coordinate time series period features of TJCORS reference stations are studied. The results show that the 3 coordinate components (N, E, U) have semi-annual and annual periodicity in topocentric coordinate system, in addition, the periodicity of U direction is more obvious than that of the other two's. The time series noise features of TJCORS reference stations are analyzed using spectral index and maximum likelihood estimator methods. The results show that the spectral index of each direction of 12 reference stations distributes between -1 and 0, which means that the model of "white noise + flicker noise" is the most appropriate to explain the reference station noise. Then, the time series noise components, annual and semi-annual amplitude and phase are figured out for GPS reference stations. The composition stability of TJCORS reference stations is discussed. The result indicates that the whole TJCORS frame has the movement tendency of southeast-east direction horizontally. In the altitude direction, the annual settlement values in CH01 and SW01 are larger, but there are almost no settlement emerging in reference stations of CH02, JIXN and TJA1 that are located in the north part of Tianjin. The calculation results of TJCORS are compared with the settlement contour isograms of 2006-2007 and levelling survey velocity of 2007-2009. The settlement results gained by the TJCORS reference stations are mainly identical with those measured by levelling monitor.