Multi-camera relay station is usually used to relay pose parameters among neighboring nodes in the videometric using camera network. An optimization method based redundancy calibration is proposed to solve the problem. Firstly, the number of independent pose parameters, the maximum number of measurable pose parameters and the minimum number of restricted condition were analyzed for a normal multi-camera relay station. Then, the optimized calibrating algorithm for a typical four-camera relay station was given，and the optimized method for general relay station calibration was suggested as well. Finally, a numerical simulation of the proposed algorithm for four-camera relay station calibration was conducted. The results show that the algorithm is feasible and effective.