Taking as the study objects for the five observation wells of underground water level with high earthquake reflecting ability in the provinces of Shanxi,Hebei and Inner Mongolia,the paper studies and discusses the generality of the precursory wave of well water level.It is indicated that the precursory wave happens commonly before strong earthquakes,with a ratio up to 65 percent（41/63）.The characteristics of precursor waves of different observation wells are different.Even for the same observation well,the characteristics of precursory wave for different earchquakes are different too,which may be the result that different observation wells have different well-water-bearing bed structures and different earthquakes have different source parameters.Compared with the single well water shake waves,the recording time of precursory wave before strong earthquakes is slightly less than that of the water shake waves,with a ratio between 39.7 and 50.7 percent.The number of observation wells with precursory wave recordings before earthquakes accounts for up to 66.7 percent of the total of observation wells.Except for its characteristics,the precursory wave of well water level has its generality both in terms of the recording times and space.[著者文摘]