Abstract: Joint calibration is a method to calibrate interferometric parameters of several adjacent scenes simultaneously, which needs less Ground Control Points (GCPs) and can realize the elevation continuity among the adjacent scenes. As the biases of the parameters can be acquired by solving the equations of GCPs and Corresponding Points (CPs), this paper presents one such joint calibration method by solving the equations using weighted optimization method. And the weightings depend on the correlation coefficient and location of the GCPs and CPs. This method can improve the Digital Elevation Model (DEM) accuracy, and this paper illustrates its successful application to interferometric SAR data.