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Signification displacements caused by the2011Tohoku-Oki earthquake(Mw9.0)can be detected by GPS observations on the north and northeast of Asian continent which comes from Crustal Movement Observation Network of China(CMONOC).Obviously horizontal displacement which can be detected with many GPS stations reaches to almost3cm and2cm and most of those extend eastward pointing to the epicenter of this earthquake. Those data can be acquired rapidly after the earthquake from CMONOC. Here, we will discuss how to calculate the seismic moment with those far-field GPS observations. The far field displacement can constrain the pattern of finite slip model and seismic moment using spherically stratified Earth model(PREM).In the research we also compare the different between point source and finite fault on the direction and the magnitude of the displacement with the dislocation theory. Using computations and comparisons, we discuss horizontal displacement calculating with low degrees and whole frequency. This study shows that far field GPS data can constrain the slip pattern of the2011Tohoku-Oki earthquake(Mw9.0)and give a reference for other research to study seismic source rupture. The low degree more n=15is equal to the hull spectrum when the distance is away from the epicenter about 3000 km.