Abstract: Based on the conductive mechanism of the carbon f iber reinforced cement (CFRC) composite , a mathematic model was set up to describe the conductivity of CFRC. By using the model , the relationships between the elect ric conductivity and the microst ructure parameters as well as the motion parameters of carriers within the CFRCcomposites were obtained. Moreover , the load sensitivity of CFRC composites was analyzed in terms of the conductivity model. The theoretical deductions obtained from the model were in good agreement with the experimental results , which proved the rationality of the conductivity model of CFRC.