In order to control the efficiency of then information system introduction , enterprise often orgainzed with a project team. Project team is organized with provisionally of variant manpower and business. In the information system introduction or project team evolution will face organizational learning and reengineering process. While in the organizational learning, member of organization always act defensively with Model I theories, and the defence behavior will bring negative influence or limited learning. While project team evolution have the same defence behavior, those defence behavior will bring bad influence of organziation. This research uses case study probe into the information system introduction and project team evolution defence behavior , let us understand those behavior and the influence of project team evolution. In this research, we describes the case of the information project introduction and project team evolution with five stages and ten events. and analysing those ten events with thoeries of the organization defends in the information management of Argyris. Its result show the member of project team, user , executive of managers all have behavior of defending in the introduction of project. Those defence behavior of the project team evolution or information system introduction, will all exert a negative influence on company's organizations or information systems. This research in order incident these defend behavior and influence result , let enterprise reference with a information project team evolution.