Fighting-determination ability is an important component of the tactical attainments and is one of key questions to generate battle effectiveness. According to original variation of the current junior officers, and quick improvement of new equipment's functions, to adapt to the complicated information-based battlefield circumstances, and play the main role in land battle, the component elements and implementation approaches of the training system for junior officers' fighting-determination were studied. It integrates many sub-systems and databases and has the advantage of strong cohesion and weak coupling. The training system simulates the process from studying professional basal courses to cultivating fighting-determination for junior officers of armored force. It has been used in the operational labs of military college, and has been taken a good effect upon training practice.