Abstract: By using the statistical analysis method, the ionospheric VTEC data of ten days before and after the Lushan M_S7.0 earthquake have been analyzed and discussed in detail, based on the GIM data offered by IGS and the Crustal Movement Observation Network of China.The results show that obvious VTEC reduction appeared between 16 and 21 April, 2013. So the abnormal variations of the ionospheric TEC may be precursors to the earthquake, excluding the solar activity factors.