Option games were used to get the trigger level of acquisition with different information. In a market without competitors, the trigger level for the acquisition company depended on the tradeoff between the acquisition companies and the target ones balancing the value increasing and the cost increasing. Considering competitors, the trigger level for the acquisition company depended not only on the tradeoff between the acquisition company and the target company, but also on the tradeoff between the acquisition company and the competitors,balancing the value increasing, the cost increasing and the hazard rate. The above results were verified through the emulation experiment of acquisition strategies with different information.