After the 2015 Nepal M_S8.1 earthquake,a strong and moderate seismic belt is gradually spreading along northeastern direction in the Qinghai-Tibetan plateau. In this paper,we attempt to summarize the feature and investigate the primary mechanism for this behavior of seismic activity,using a 2D finite element numerical model with the constraint of geology tectonic and GPS velocity. Additionally,comparing with the NE seismic belt triggering by the 1996 Xie-Tong-Men earthquake,we discuss the earthquake hazard in future in and around Qinghai-Tibetan plateau. Our results show that the NE direction seismic belt is the response of enhanced loading on anisotropic Tibetan plateau from the India plate and earthquake thrusting. Also,this possibly implies that the incoming strong earthquake may fill in the blanks of the NE direction seismic belt or enhance the seismic hazard in the eastern(the North-South Seismic Zone)and western(the Tianshan tectonic region)parts near the NE direction belt.