Tacit knowledge is of high value, but it is concealed and difficult to measure in project organization. The authors have carried out an analysis on sharing approach of tacit knowledge. This paper summaries the barriers to influence tacit knowledge sharing, such as too rigid project organization structure, organizational culture based command or workftow, limited organizational communication mode, the performance appraisal system to be improved, and so on. In view of above-mentioned factors, the authors bring out the relative solutions, such as constructing the learning organization and the tac...