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Beidou Satellite Navigation System (BDS),developed by China,is an independent satellite navigation system,which is recognized as one of the four major Global Navigation Satellite System (GNSS) in the world.Now,BDS has a constellation of fourteen navigation satellites and the regional satellite navigation system of BDS has been constructed.The system can provide high quality services in China and its surrounding areas,and is extending into global.In this paper,the current status of BDS and GPS is introduced at first.And then,the algorithm of high precision fusion positioning with combination of BDS and GPS isstudied based on variance component estimation.Finally,a GNSS geodetic control network is performed as an example,which contains eight points withcorresponding baselines ranged from 40km to 200km.It is proved that,combining BDS and GPS datacan present better results than that of any single navigation system using the proposed algorithm and the accuracies of position arebetter than 1cm.