Abstract: In this paper, the tide-response functions of water level data from 20 wells in 1983~ 2001 are calculated in Beijing, Tianjin, Hebei, Shanxi regions. The tide-response function and phase lags of M₂, O₁, K₁, S₁ waves are given. The M₂ waves tide-responsedynamic characteristics is analyzed by the tide-response M₂ waves and the magnitude of its relativeerror. This isone of physical characteristic indexused to assess thedetecting ability of water level wells quantitatively.

Key words: Water level well, Tide-response function, Characteristic index