This dissertation explores the issues of mixed oligopoly, restructuring, and M&A that occurs in turn on the stages of policy set-up, preparation, and performing when the government attempt to privatize the state-owned enterprises (SOEs). On the policy set-up stage, private firms in domestic market are not necessary confined to originate at home country. Foreign private firms may establish an oversea subsidiary and create a mixed oligopoly market structure at home country. In addition, those foreign private firms may not passively accept all the trade policies that came from the government decision of home country. Mixed oligopoly competition between one domestic public firm and one subsidiary of foreign private firm is been formulated to investigate the following questions: (1) how the agents compete under the cases that home country government adopts policies such as corporate tax rate, repatriation tax rate, and partial offering public stocks; and the foreign private firm implements strategies such as vertical integration and transfer pricing; (2) the impact on social welfare and the decision of optimal public stock-offering ratio while home country government¡¦s policies and foreign private firm¡¦s strategies have changed. New findings include (1) Home country government can not maximize social welfare by simply adopting strategic policies; (2) For home country government, the best strategy for privatizing SOEs maybe partial privatization; (3) For home country government, ¡§mass privatization¡¨ should be avoided as the means of manipulating domestic market shares. On the preparation stage, an incentive scheme model is designed to analyze the governance mechanism for improving SOEs¡¦ situation. First, different types of SOEs are classified according to their own ability and the employees¡¦ attitude for privatization. By offering a sound device of incentive scheme, the government is able to strengthen the SOEs¡¦ ability and employees¡¦ desirability. Within a one-stage symmetric information game framwork, it proves that SOEs with high ability and their employees with high privatization desirability can implement the highest amount of public stock offering ratio. Next, it utilizes a two-stage asymmetric game model for discussing how to improve the SOEs¡¦ ability and how to encourage the employees to support privatization. By providing an incentive contract, the government not only can coerce the SOEs but also can inspire their employees to reveal their true information. The due process of public stock offering is able to strengthen the abilities of SOEs via ¡§restructuring¡¨ on the one hand, and to facilitate the issue of ¡§training subsidies¡¨ for hatching the entrepreneurship of employees on the other hand. Finally, it investigates the impact on public stock offering ratio for the amount of specific grants, and found that the more generosity of incentive contract, the higher the public stock offering ratio. On the performing stage, it adopts the incentive theorem to analyze the outcome of SOEs¡¦ privatization by inviting a named firm. The named firm takes over the SOEs through M&A for the purpose of long-term operation. In order to encourage the employees of the privatized company working more aggressively, the named firm comes up incentive schemes including bonus-sharing and Employees Stock Ownership Plan, ESOP. It found that whether there exists information asymmetry or not between the named firm and the employees of the privatized company will affect the following decision-makings: the level of the employees¡¦ effort, the willingness of the employees¡¦ stock-holding, and the achievement of the named firm¡¦s profit maximizing objective. In particular, it shows that the change of the contents of the incentive schemes will affect the bargaining outcomes between the named firm and the trade union of the SOEs on the issue of working conditions after privatization.