This paper describes the cross research field among management, decision theory and information science——engineering management entropy research. Firstly, the necessity and scientificity are discussed. Then its theoretical basis, methods and models are explained. Especially, the complex entropy decision making method, group decision making entropy model and multivariate coupled decision-making entropy method are described. Finally, the engineering management application cases are given, which prove that the proposed engineering management decision model based on entropy can effectively solve some key decision-making problems in practical engineering management.