在工程招标投标过程中，以违法违规为特征的合谋现象屡禁不止，严重扰乱了市场竞争秩序，成为建筑业健康稳定发展最大的“拦路虎”。合谋投标的不正当性、隐蔽性、稳定性、组织性使得防范与治理的难度巨大。研究工程合谋的形成机理，在此基础上构建有效的防范策略，尤其重要。课题结合工程招标投标活动以及投标人与环境交互关系，以认知科学、行为科学为分析范式，应用Umwelt理论、社会关系网络理论、项目管理理论、决策理论等多学科交叉技术，从表意、符解、符号关系网络等角度揭示合谋投标人对工程竞争环境认知的形成机理，分析合谋投标人一致行动域和行动选择规律，模拟仿真合谋投标人的报价决策和成员调整，进而从政府、招标人和独立投标人的角度构建三方防治对策。研究成果将有利于采取更加科学合理的对策，规制不良的投标行为，提升建筑市场的资源配置效率。

In the practice of tendering, the happenings of collusion cannot be eliminated completely, which often causes the construction market to be disordered. Tenderers’ collusion has been considered as one of the major barriers to attaining sustainability in the construction industry. It is characterized by the nature of illegitimacy, stability, elusion and organizability. These characterizes make it very complicated to prevent and oversee tenderers' collusion prevention in an easy way. Therefore, it is imperative to examine the formation mechanism of tendering collusion and to develop appropriate control measures. In this study, the uniqueness of construction competition, tendering and the interaction between tenders and the surrounding environment are interpreted using cognitive and behavioral approaches. Multidisciplinary theories of Umwelt, social network, project management and decision-making are employed for the purposes of signifying, symbolic interpretation and syntactic analysis. Thereby, collusion perception, collusive concerted actions and the rule of action selection, collusive decision-making and member changes are simulated. This study can offer suggestions for government, clients and independent bidders to tackle collusion in construction tendering, and helps restrain adverse market behaviors, resume market orders, and improve the efficiency of resources allocation in the construction market.