two popular views on the magnetic topologies of filaments. One view is the shear-arched model [@kip57; @ama91; @ant94; @wel05] and the other is the flux rope model [@kup74; @dem89; @yang14; @yan15; @che17]. Using two-dimensional magnetohydrodynamic (MHD) numerical simulations, [@che00] proposed reconnection-favored emerging flux could cancel with the magnetic field below the flux rope or the magnetic field on the outer edge of the channel and led to the eruption of the flux rope. Torus instability and Kink instability are also proposed to be the triggers for the eruption of the filaments [@tor03; @kli06; @jia13; @yan14; @li16].

Formation of the filaments, which consists of the formation of magnetic structures and the mass supply, is still controversial. Regarding of the first term (formation of the filament magnetic structures), many researchers have suggested two different mechanisms to form magnetic structures of filaments: surface effect [@van89; @mar01; @yan15; @yan16; @wan17; @xue17; @che18] and subsurface effect [@rus94; @oka08; @oka09; @mact10; @lit09; @lit10; @yan17]. In the former, the magnetic structures of filaments are formed gradually through the magnetic reconnection driven by various photospheric motions (such as sheared flow, converging flow, and rotating motion). In the latter, the magnetic structures of filaments are thought to be formed 