On July 12,2020,an M_S5.1 earthquake occurred in Tangshan,Hebei Province. The earthquake early warning system of Hebei Province has successfully processed and output all kinds of related data for earthquake early warning. In this paper we analyzed the output data quality of stations within 200km away from the epicenter in the Hebei early warning network,as well as the first 5 processing results of the JEEW earthquake early warning system of the Research Institute of Shenzhen. The earthquake occurred within the Hebei early warning network with an average distance of 10km between stations. Compared to formal reports of China Earthquake Networks Center,the first alarm of JEEW was generated in 3s after the first station triggered,in 6s after the earthquake,with a location error of 2.6km,and magnitude error of -1.3,and blind spot radius of 18km. With the increase of participation number positioning stations,the magnitude and location error are getting smaller and smaller,but the absolute value of magnitude is still small. For Hebei early warning network,the average signal-to-noise ratio of the intensity stations within 200km of epicenter is 48,and the average signal-to-noise ratio of the intensity stations within 50km of epicenter is 112,which fully meets the requirement of early warning system of signal to noise ratio. The earthquake early warning results of the Tangshan M_S5.1 earthquake show that the layout of the stations within the network is basically reasonable,the waveform quality is high,and the JEEW earthquake early warning system of Shenzhen Research Institute has a good early warning effect in this earthquake. Overall,Hebei early warning network has been of a certain earthquake early warning ability.