Participation as an effective approach has provided a comprehensive response in different level and areas of management, especially project management in deal with postmodern criticisms which have been mentioned against modern management. But what have been neglected are foundations and influential factors on participation improvement. It is important because identification of these factors can have significant influence on our ability to offer effective and practical solution to improve participation phenomenon. This research with the aim of covering this gap in literature has been concentrated on the decisive role of project communication system quality in the improvement of project team participation sense as an important factor and amplifier of participation phenomenon. For this reason, with quantitative approach and by using descriptive-analytical research method, field data have been gathered and factor test has been used in order to diagnosing factors for both communication quality system and participation sense of project team. Result of factor analysis provides the condition in a way that research hypothesis be testable and practical solution be presentable. In final, the test of research hypothesis by using Pearson correlation coefficient, showed positive correlation between project communication system quality and project team participation sense.