This paper presents the basic parameters and moderate term pre-diction of the Sheyang earthquake (M=5.1)on Feb.17,1987. Based on the urgent and short anomalies before the earthquake, the author finds that these anomalies have periodicity, synchronism and relativity in temporal distribution and the space distribution appears character of "multi—source" precursory field. In view of the above, also discusses the possibility of predicting moderate and strong earthquakes in Jiangsu Province and South Yellow Sea areas.