Abstract: The current study tends to treat the organizational routines as a "black box", this paper tries to explain the replication activity of routine; First of all, re-define the routine from the perspective of habit, and one condition of replication is added from the angle of complexity; Successful replication requires 4 basic conditions:causality, similarity, information transmission and complexity. The key of replication is to form a mechanism by which the complexity of replicated objects can be retained during the replication process. Then, we use cellular automata to simulate the replication process. The conclusions are as follows:the key of routine replication is to identify the explicit or implicit rules. Even if the rules have little vague, it will expand in replication activities, and then undermine the stability of replication. If the rules are clear, new routines will be formed because of different endowments between different enterprises.