Abstract: In order to eliminate the inconsistency of the existing data from multi-satellite missions,a new method is proposed for optimal combination of the altimeter data.In the data management system,the crossover adjustment is modified to a two-step processing based on the posteriori compensation theory of error,i.e.the crossover adjustment of condition equations is made in the first step,and the filtering and prediction of adjustment corrections done along each single pass in the second step.Using the new approach can simplify the solution procedure of crossover adjustment greatly,and the stability and reliability of its computation results can be expected.The new method can be used to both local and global crossover adjustment problem.Finally,practical altimeter data set from Geosat,ERS-1,ERS-2 and T/P is used as a case study to prove the efficiency of the integrated data processing method.