Based on the construction interfaces in rolled control concrete dam(RCCD), the methods were proposed to calculate the influence thickness of construction interfaces and the corresponding physical mechanics parameters. The principle on establishing the coupling model of seepage-field and stress-field for RCCD was presented. A 3-D Finite Element Method (FEM) program was developed. Study shows that such parameters as the thickness of construction interfaces, the elastic ratio and the Poisson's ratio obtained by tests and theoretical analysis am more reasonable, the coupling model of seepage-field and stress-field for RCCD may indicate the coupling effect between the two fields scientifically, and the developed 3-D FEM program can reflect the effect of the construction interfaces more adequately. According to the study, many scientific opinions are given both to analyze the influence of the construction interfaces to the dam's characteristic, and to reveal the interaction between the stress-field and the seepage-field.