Abstract: Aiming at the critical chain identifying problem, which is the fundamental issue in critical chain project management, a two-stage critical chain identifying heuristic method is introduced based on the theorem of activity′s center of gravity. The well-known Patterson 110 instances are resolved by this new algorithm and three other heuristic methods using different priority rules. Comparing the calculation results by the mathematical statistical hypothesis test method, statistics show that the newly built method is advanced and greatly simplifies the identification of critical chain.