At 08:46:43 UT, two filamentary structures had formed, which were marked by two blue arrows. Panel (c) of Fig.\[fig1\] shows the line-of-sight (LOS) magnetic field from $SDO$/HMI at 09:49:30 UT, which manifests that the south-western footpiont of the filament roots in the positive magnetic field and the north-eastern footpoint roots in the negative magnetic field. Panels (d)-(f) of the Fig.\[fig1\] exhibit the formation process of the filament in 304 $\rm\AA$ images observed by $SDO$/AIA. At 09:50:09 UT, a filament could be seen in the place marked by the blue arrow in the panel (f) of Fig.\[fig1\]. The detailed evolutionary formation process of this filament is shown by the animation of Fig.\[fig1\]. According to the animation, we find that a series of jets driven the cool plasma or chromospheric material to filament height. Unidirectional material motions driven by the jets besides the south-western footpoint of the filament were found and then the filament generally appeared. It should be noted that some of this plasma could remain at the filament height and contribute to the mass of the filament, while some of this plasma could instead fall down to the chromosphere.

![Formation process of the filament. (a)-(b) H$\alpha$ images observed by NVST 