Abstract: The high precision and resolution global mean sea surface height (MSSH) model is the basis of research on variation of ocean dynamic environment. Based on multi-satellite altimetric data, including Geosat/GM、Geosat/ERM、ERS-1/168、ERS-2、Envisat-1、T/P and Jason-1, this paper improves and re-computes their geophysical corrections by unified accurate models and methods. Then, by assuming the dataset combing the T/P and Jason-1 measurements which are collinear adjusted as reference, the radial orbit error and time-variation affect of sea surface height are reduced through the developed whole combination crossover adjustment. Furthermore, global MSSH model named WHU2009 with the boundary from 80°S to 82°N and resolution of 2′×2′ is achieved by remove-restore method and least square collocation grid method with EGM2008 high degree gravitation model. Compared with CLS01 model that commonly used internationally and the dataset that collinear adjusted with 2 year Jason-1 measurements, it is concluded that WHU2009 has better integrated accuracy than CLS01.