Abstract: Collocation method, when applied to crustal deformation analysis, can estimate the deformation trend reliably not only of the observed points but also of the unobserved points. But if there are faults or hidden faults in the researched area, accustomed collocation is not proper to deformation analysis because of the discontinuous deformation. So collocation based on regional tectonic deformation background is proposed, which divides the area roughly according to geology information and then establishes collocation models respectively in each division. The points near by the boundary are differentiated by confidence interval of deformation parameter. Since the local deformation or abnormal observations may influence the reliability of modeling, robust estimation with high breakdown point is applied to calculate model parameter which is not disturbed by abnormal points. Simulated and practical examples are given and the results prove the efficiency of the proposed method in this paper.