Variation features of geotemperature in the depth of 10 m by Gaoling observation point before the Jingyang M_S4.8 earthquake on Jan. 5, 1998, Shaanxi province are studied and analyzed. The geotemperature fell continually in 1997. The geotemperature rose suddenly from Dec. 15, 1997, especially in 15 days before the event and returned to normal after the event. Geotemperature variation in the depth of 10 m by observation point of high pressure switchgear plant of Xi'an city is the same as that by the Gaoling point. It is believed that rising variation of the geotemperature by the Gaoling point is the anomaly before the Jingyang M_S4.8 earthquake.