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A new method is proposed for realizing a stochastic system from interconnected smaller stochastic systems. Each smaller stochastic system considered is composed of two states. The basic tool is the partition with a substitution property which exists on the transition matrix of the interconnected stochastic system. Using the authors' method, a stochastic system with n states is decomposed into m(m≥n-1) component systems where each system has two states. The following results are derived: for a given outer input, each component system has n-1 state transition matrices; a relationship exists among some entries of transition matrices; and the whole system is composed of m component stochastic systems, but m-n+1 component systems are selected freely.