shows the time-distance diagram derived by a series of the images observed by the NVST H$\alpha$ band from 05:51 UT to 06:35 UT. According to this time-distance diagram, the projection velocities along the two dotted white lines are about 22.1 km/s and 24.1 km/s, respectively. The mean projection velocity is about 23.1 km/s.

![The material injection event observed by the NVST. (a)-(b) H$\alpha$ images observed by NVST at 05:59:00 UT and 06:11:19 UT. The blue arrows in the panel (a) & (b) indicate the brightenings in H$\alpha$, while the white dotted lines indicate the same path for the time-distance diagram in pane (e). The blue dashed line in panel (b) denotes the position of the time-distance diagram in panel (c) of Fig.\[fig5\]. (c)-(d) $SDO$/AIA 304 $\rm\AA$ images at corresponding time. (e) The time-distance diagrams derived from a series of H$\alpha$ images from 05:51 UT to 06:28 UT. \[fig4\]](figure4){width="\columnwidth"}

In order to investigate these jets related to the material injection of the filament, we calculate the intensities of the $SDO$/AIA seven bands (94 $\rm\AA$, 131 $\rm\AA$, 171 $\rm\AA$, 193 $\rm\AA$, 211 $\rm\AA$, 304 $\rm\AA$, 335 $\rm\AA$) integrated in the yellow box in the panel (d1) of Fig.\[fig2\]. In addition, we also 