The information platform composed of multi-radar can receive various groups of target data at the same time，and data fusion has become an inevitable technique for this platform to process data. Data fusion can improve the data rate of the target and the target measurement accuracy, meanwhile, it provides convenience for the integrated management and control of the whole platform. Serial data fusion algorithm is similar to the single radar target tracking process，and is easy to expand to the multi-radar platform. Serial data fusion algorithm is utilized to verify the performance of data fusion under the typical conditions of multi radar，and this typical condition is the environment which is composed by the multiple ship-born search radar. The simulation results show that the fusion algorithm can improve the tracking accuracy and increase the target detection range.