Guizhou province is a typical region of karst's lava and the shortage of engineering water restricted seriously the economic development.In order to solve the shortage of water,the Guizhou government constructed more than 1000 wells from 2013 to 2015.To save cost and improve the rate of well drilling,it is extremely important to use geophysical method for surface exploration.Firstly,this paper introduces respectively the ultra high density electrical method and EH-4 magnetotelluric method to solve rural drinking water and industrial water.And then summarizes the contour morphological characteristics of the two methods when meeting karst and fissure water(karst water shows the trap shape of bead-like,and ellipticity;fissure water shows the shape of 'V' medium-low resistance).In the end,with the combination of the principles and methods,summarizes the advantages and disadvantages of two methods and the applicable scope to guide to find waters and achieves good exploration results.%贵州省是典型的喀斯特岩溶地区,缺水严重制约了该省的经济发展.针对缺水问题,贵州省2013~2015每年水井施工超过1 000口,为了节约成本,提高成井率,使用物探方法进行地表勘查显得尤为重要.首先分别介绍了超高密度电法和EH-4大地电磁法在解决农村饮用水和工业用水方面的实例;然后总结两种物探方法在遇到岩溶水和裂隙水时等值线的形态特征(岩溶水表现为串珠状、椭圆状圈闭形态,裂隙水呈"V"字形中-低阻形状);最后结合方法原理和实例总结了两种方法的优缺点和适用范围,指导了找水工作,取得了较好的勘查效果.
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