A good teamwork will be formed in an effective team as well. The company’s success in achieving productivity or reducing production costs can be influenced by the level of effectiveness team contained there in.  The purpose of this research was to improve effectiveness team through training of team building at PT. XYZ. This research is a research that using qualitative methods with data collection in the form of interviews, observations, and questionnaire. The sample of population in this research were all HCMS division employees, amounting to 33 people. Data collection instruments in this study used the Five Dysfunctions of A Team questionnaire with a measuring tool consisting of 31 items which is consisted of 5 dimensions, namely Trust, Conflict, Commitment, Accountability, and Result. The results in this research indicate that the intervention activities made by the author in the form of Team Building Training conducted in one meeting of five sessions. These Team Building activities or training programs can be reused by the company in the future. The Team Building training provided is expected to be able to improve team and organizational productivity, the ability of the team to adapt to changing situations and conditions and healthy relationships between team members, and the demands of work, team goals, and overall organization can be achieved.