which is associated with the emergence of twisted magnetic tubes from the solar interior. The second term of the equation is named shear term, which is generated by shearing magnetic field lines due to tangential motions on the surface. Accumulative helicity and energy can be derived by the integration of the helicity injection rate and energy injection rate with the time, respectively. To reduce the noise influence from the measurement, we only consider the field with a transverse component stronger than 150 G. We use these non-potential physical parameters to investigate the newly emerging flux related to the mass supply of the filament.

Results {#sec:results}
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Formation process of the active-region filament
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A filament formed gradually in active region NOAA 11903 during the period from 02:00 UT to 10:00 UT. Active region NOAA 11903 located at the southwestern hemisphere (e.g., (460$\arcsec$, -220$\arcsec$)) comprises a positive dominant sunspot and some discrete negative magnetic fields on November 25, 2013. The formation position of the filament was close to the dominant sunspot (see Fig.\[fig1\]). The panels (a) and (b) of Fig.\[fig1\] show the formation process in H$\alpha$ observations from NVST. At 02:20:51 UT, the filament was absent in the field of view. 