Four methods,including threshold method,rate change method,trend transition method and annual change method,were used to quantitatively calculate R value of forecasting efficiency of all same underground fluid data in Zhaotong area. Based on the characteristics of anomalies and water chemistry,the seismogenic mechanism of these anomalies was discussed. The results showed that the best forecasting period of most fluid anomalies in Zhaotong area was within 3 months,especially after the anomalies extracted by the rate method and the trend turn,which is relatively significant for forecasting in short to imminent stage. The forecasting efficiency R>R₀ of 11 test items can be used as key test items for daily tracking anomaly in northeast Yunnan. It was concluded that most such the shallow precursor anomalies were caused by fluid force induced by atmospheric precipitation.