This paper introduces briefly techniques for preparing soil sections and digital images,with emphasis on influences of various experimental factors,such as image resolution,orientation of soil section,analyzed area and so on on the analysis of pore structure.Experimental results obtained by this method are subject to a deviation rate of 10%.The results showed that,for making analytical results reliable and comparable,it was very important to keep the experimental factors replicable and stable because any variation in the experimental factors could influence the analysis of pore structure.