Through reviewing and summarizing the opinions and basis of earthquake prediction before the Huoshan M4.3 earthquake on Apr. 20,2014 in Anhui Province,we found the following results:Small earthquakes have been active in Anhui area,and three seismological anomalies,including seismic band,seismic frequency and window opening of Huoshan earthquake,have appeared successively since Oct.,2013. The precursory anomalies are located within 200 km of the epicenter,including 13 items,such as mobile gravity,mobile geomagnetic,ground resistivity at Mengcheng station,short level at Feidong station and underground fluid etc.. In the mid-term phase,the monthly frequency of precursory anomalies is increasing continuously and has the characteristics of coordination. In the short-term and impending phase,the mid-term anomalies tend to end or the measured value is reversed,the underground fluid anomalies are prominent,and the anomalies gradually migrate from the periphery to the epicenter. Entering the impending phase,the monthly frequency of anomalies turns down.It follows that the anomalies were obvious before the huoshan earthquake,and precursory anomalies have the characteristics of stage and coordination in time; and the space is characterized by movement; and the abnormal morphology is characterized by repeatability.It provides a good basis for the prediction of the three elements of the earthquake.