Due　to　middle-term　and　impending　anomaly　forecast　of　earthquake　is　relatively　difficult,　taking　Wenchuan　earthquake　in　2008　as　the　studying　background,　choosing　the　severely　affected　areas　such　as　Sichuan,　Yunnan,　Shaanxi,　Gansu　and　Chongqing　Province/City　as　study　region,　the　deep　groundwater-level　anomaly　characteristic　was　analyzed　in　this　study.　In　Sichuan　region,　where　Longmen　Mountain　fault　locates,　and　Gansu　region　along　NE　direction　of　Longmen　Mountain　fault,　seven　wells　groundwater-level　appeared　clear　impending　ano-maly,　including　oscillatory　type,　pulse　type　and　step　type.　By　wavelet　transformation　analysis　to　oscillation　and　pulse　anomaly　of　groundwater　level,　the　results　showed　that　Linxia,　Gulanghengliang,　Qingshui　well　water-levels　exist　similar　precursor　waveform,　with　a　cycle　of　2-8　min　and　an　anomaly　amplitude　5-59　mm.　They　were　the　results　of　seismic　wave　from　source　slow　rupture　of　source　body,　indicating　the　coming　of　large　earthquake.　On　the　other　hands,　step-type　anomaly　amplitudes　were　relatively　large,　respectively　129.4　cm　and　340.8　cm.　They　last　from　a　few　minutes　before　earthquake　to　after　earthquake,　and　couldn＇t　recover　the　state　before　earthquake.　It　showed　that　the　driving　function,　which　caused　dramatic　changes　of　groundwater-level,　had　begun　before　earthquake,　and　their　coseismic　anomaly　were　further　developed　and　intensified　on　the　basis　of　it.