calculate the negative flux in the yellow box in the panel (d1) of Fig.\[fig2\], which is due to the complexity of the positive magnetic field nearby the south-western footpoint of the filament. Fig.\[fig5\] (a) shows the time variations of negative flux and its increasing rate ($d|\phi|/dt$) during the period from 02:00 UT to 10:00 UT on November 25, 2013. The first vertical red dashed line indicates the onset of the material injection derived by the NVST, which is about at 05:09 UT on November 25. The negative flux enhanced gradually about from - 0.2 $\times$ $10^{21}$ Mx to - 5.5 $\times$ $10^{21}$ Mx during the period about from 05:00 UT to 07:45 UT, and the mean rate of enhancement is about 4.3 $\times$ $10^{17}$ Mx $\rm s^{-1}$. This means the new flux emerged from the subsurface in the vicinity of the south-western footpoint of the filament during the period from 05:00 UT to 07:45 UT. During the period from 07:45 UT to 10:00 UT, the negative flux decreased gradually from - 5.5 $\times$ $10^{21}$ Mx to - 3.5 $\times$ $10^{21}$ Mx, and the mean rate of decrease is about 2.4 $\times$ $10^{17}$ Mx $\rm s^{-1}$. The front four jets occurred 