Abstract: To quantify the critical point of controlling moral hazard keeping supply chain from operating normal, a complex networks model of moral hazards in supply chain, with perspective of people in this system, is constructed, and the properties of inducing and transferring moral hazards in supply chain and the law of topological evolution of supply chain moral hazards system are given. By invoking percolation theory and the corresponding methods coupling with the property of transferring character of moral hazards in supply chain, control moral hazards and their transferring process according to random attack and intention attack, respectively, and the minimization number of the employees should be controlled, so as to give the percolation criticality of moral hazards in supply chain. It is concluded that random attack makes moral hazards robustness but intention attack make them vulnerability, Furthermore, the intention attack to moral hazards in supply chain is effective, and the probability of controlling moral hazards of intention attack in supply chain is decided by the configuration of supply chain with perspective of staffs and the property of moral hazards.

Key words: moral hazards in supply chain, percolation, criticality, random attachment, intention attachment, simulation