NOAA 10930 was a fast developing active region. We take on the analysis of the fine features of vector magnetic field in active region NOAA 10930 on 2006 December 12, which vector magnetograms were observed by SP of Hinode in Fig. 1. For resolving the 180o ambiguity of the transverse components of vector magnetograms a method for the minimum of angle difference have been used, which is to find the minimum of the azimuth angle between the observed transverse field component and that of a linear force free field, calculated by using the line-of-sight component as the boundary condition for the field normal to the image plane. It is fond the relevant consistence with the evolution of vector magnetic field in the active region, even if the magnetic field in the active region is far from the linear force free magnetic field.
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