Abstract: On the basis of the annual report for the earthquake trend of Tianjin from 2002 to 2011, this paper collected the precursor anomalies of the observation projects in Tianjin earthquake precursor network. And selecting M_L ≥ 4.0 earthquakes occurred in capital area and M_S ≥ 5.0 earthquakes occurred in North China as earthquake examples, we analyzed the earthquake reflecting ability of Tianjin earthquake precursor network thoroughly from the overall earthquake-reflecting capacity, the earthquake-reflecting proportion of the observation projects, the proportion of the seismic precursor, the earthquake-reflecting directionality of the precursory network and the earthquake-reflecting capacity of the various subjects, etc.Finally, this paper discussed the existing problems in tianjin earthquake precursor network.