The system of management of a development company in general and its subsystem of environmental management in particular are studied in this article. The conception of the "system" management of the company is revealed. The main management aspects of the company are defined. The elements of the system are determined, namely: the subsystem of management, the subsystem of planning and control of deadlines and costs, the management subsystem of the safety of life and health, the subsystem of quality management and the subsystem of environmental management. The casual relationship between the implementation of development projects and environmental changes is observed.