The charcteristics of deformation monitoring are lots of points ,high frequncy ,and long period,so improve some subtle link may enhance the efficiency for such long peroid deformation .Geodesy network mobile office system , called GeoNMOS,has powerful indoor and field work function and improve the free station deformation method based on ordinary free station deformation method .Therefore,this new method can reduce the gross error probability and enhance work efficiency,thus it’s worthy for large engineering projects.%变形监测的特点是测点多、频率高、周期长，因而改善某一个作业环节，对于长远的周期性变形监测来说，都可能提高作业效率。网络化移动勘测办公系统（ GeoNMOS）具有强大的内外业一体化功能，并在常规自由设站法变形监测的基础上，改进了变形监测作业方法，降低了粗差出现的概率，提高了内外业工作效率。
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