We observed an H \alpha surge occurred in the active region NOAA 12401 on 2015 August 17 , and discuss its trigger mechanism , kinematic and thermal properties .
It is suggested that this surge is caused by a chromospheric reconnection which ejects cool and dense material with the transverse velocity about 21-28 km s ^ { -1 } and the initial doppler velocity of 12 km s ^ { -1 } .
This surge is similar to the injection of newly formed filament materials from their footpoints , except that the surge here occurred in a relatively weak magnetic environment of 100 G. Thus we discuss the possibility of filament material replenishment via the erupting mass in such a weak magnetic field , which is often associated with quiescent filaments .
It is found that the local plasma can be heated up to about 1.3 times of original temperature , which results in an acceleration about -0.017 km s ^ { -2 } .
It can lift the dense material up to 10 Mm and higher with a inclination angle smaller than 50 ^ { \circ } , namely typical height of active region filaments .
But it can hardly inject the material up to those filaments higher than 25 Mm , namely some quiescent filaments .
Thus we think injection model does not work well in the formation of quiescent filaments .