Abstract: With solar orbiter being put into successful operational observation, solar magnetic observation has entered the era of remote sensing from dual view points.In this paper, we carried out a simulation of correcting the 180° ambiguity of transverse magnetic field with magnetograms from dual view pointsusing analytical formula as well as observations made by the Helioseismic and Magnetic Imager (HMI). Magnetograms of a small mature sunspot at differenttimes were used to simulate magnetograms from dual view points. We find that, in order tocorrect the 180° ambiguity of the vector magnetograms, it is sufficient to have a line-of-sight magnetogram from another view point to help to judge thedirection of the transverse magnetic field. For the measuring accuracy of HMI, we estimate that a~30° angle formed from two observational points is the smallest angle to correct the 180° ambiguity around the place with the magnetic field strength of <50Gs. Correction for weaker magnetic fields surely needs larger separation angle, but considering projection effect, we propose that separation angles of ~30° are the optimal angles for future space missions with the scientific aim of correcting the 180° ambiguity of vector magnetograms.