中文摘要：

对社交网络信息传播规律和传播过程的研究，目前主要有实证分析、数理模型和传播动力学三种理论或方法．应用博弈论的思想，从微观个体的角度出发，将关系层次作为重要变量加入到模型中，分析社交网络用户传播信息时的成本、收益和策略选择．结论认为：只要传播信息的收益大于成本，用户都会选择传播信息；用户之间的关系越紧密，越容易相互传播信息和共谋；非共谋行为并不是一个纳什均衡策略．并分析了用户的混合策略纳什均衡，使研究更接近现实，对社交网络用户信息传播的决策具有一定指导意义．

英文摘要：

At present, there are mainly three theory or methods are applied to research information transmission in social networks： empirical analysis, mathematical model and tran- smission dynamic theory. By game theory and adding the level of relationship to game model as an important vector, this paper analyses cost, tradeoff and strategies of social networks users. The result shows that users will transmit information as long as their profit is more than cost, they prefer to spread information and collusion each other if their relationship is closer, non-collusion strategy is not a Nash equilibrium. The mixed strategy equilibrium is given so that this re- search is close to reality and therefore has some theoretical and practical implication for the strategy of social networks users in infor- mation transmission.