In a supply chain, different companies have different, even conflicting goals and make decisions based on their own profit, so the asymmetric information can be found everywhere. The informed party may withhold or convey wrong information, and the uniformed party wants to get it or verify it. The screening and signaling increase contract cost and decreases supply chain efficiency. Hence, the asymmetric information is the main cause which leads to non-coordination. The information transparency model is built to analysis the game process among the players in the supply chain under the asymmetric information, and the condition of supply chain equilibrium is also discussed in this paper.