By using the data from JUN and JUX stations in Linyi area of Shandong Province, in this paper we calculate the cross-correlation function between stations from January 1, 2009 to January 1, 2011 by applying seismic ambient noise cross-correlation technique, and then calculate the relative velocity variation by applying the moving window cross spectrum method, and finally analyze the precipitation recorded by Juxian meteorological observation station and the groundwater level change recorded by Junan Lu No.14 well in between the two stations. The results show that the regional precipitation changes seasonally, with relatively high precipitation in summer and relatively low precipitation in winter. The groundwater level changes seasonally too, in which the water level is low in early summer and then increases gradually. The groundwater level is relatively high in early winter and then decreases gradually. On the other hand, underground medium velocity also seasonally changes with the variation amplitude of about ±0.2%, which has a certain negative correlation with the water level change, i.e., the groundwater level is higher in summer than that in winter with the decrease of the variations of relative velocity decreases, and vice versa.