The influence of modification on the characteristics of moisture transportation of earth materials was discussed. Development of capillary absorption rate, capillary absorption coefficient and surface infiltration depth with different modification methods, such as modified by cement, by jute and by composite of above two, was researched through capillary absorption test. The results show that there exists linear relationship between capillary absorption quantity and square root of time. Comparing with original earth materials, capillary absorption coefficient and initial absorption rate of cement modified earth material is reduced by 198% and 253% respectively, and while that of jute modified earth material is increased by 434% and 262%. Modification of jute on surface penetration depth of original earth materials is obvious.The pore distribution of earth materials and surface state of soil particles is changed due to the modification effect of cement, and therefore, moisture transportation characteristics of earth materials is accordingly changed.