Based on study of some precursors before 3 moderate strong earthquakes in south-east part of Gansu provice, it is found that all kinds of precursors show harmonious character in temporal-spatial. The result shows that the anomalies last shorter time and mainly in middle-short term, but in impending term is not clear. From one year to short-impending stage, the anomalies migrate to earthquake epicenter. The distribution of precursor anomalies and low b value are concentrated to same area. The relationship between the harmonious character of precursors and transportation of underground fluid and thermal material in deep crustal is discussed.