To close the gap of the information-theoretic model of information hiding and make full advantage of discreteness of information hiding activities

the paper proposes a space model of information hiding.The model utilizes set theory and matrix space conception to describe the basis of information hiding

denotes the elements of information hiding by space conception and describes the processes by space transforms primarily

and then deduces the quantitative formula of information hiding benchmarks.The results show that it can explain most of present information hiding technologies effectively and it is more operable in the developing of information hiding systems.