With the progress of technology and development of the society, higher and higher uncertainty inside and outside the project makes the management facing a big challenge. From the systemic meanings of harmony, this paper discusses the philosophical status of harmony in the project management,introduces the harmonious management theory,and then points out that the harmonious management is the methodology through whole cognitive levels. It then brings forward a harmonious model of the project management. At the end,this paper explores a new research route of the modern project management at the visual angle of the harmonious management theory.