通过室内对粉煤灰透水性和各向异性的研究，了解试验方法对渗透系数及各向异性的影响程度，以更好地判定灰坝渗流计算成果的可靠性．研究表明，灰的渗进各向异性主要取决于与试样制备方法有关的结构性．对于具有同样结构的粉煤灰，渗透系数愈小，分层愈多，则渗透各向异性愈大． Through the indoor research on the permeability and anisotropy of fly ash, the influence of test methods on the permeability coefficient and anisotropy is studied, so as to better determine the reliability of the calculation results of the seepage flow of the dam. Research shows that the seepage anisotropy of the ash depends mainly on the structural properties associated with the sample preparation method. For fly ash with the same structure, the smaller the permeability coefficient, the more stratification, the greater the permeability anisotropy.