The simulation of group-work interaction is significant for Chinese enterprise organizational management. As a result, a cellular-automata based simulation model is put forward. The number of cells is specified equal to the one of group members. Group members consist of working-hard members and social ones, or regular ones and irregular ones. Time delay and information distortion are taken into account in the model. Work includes various degrees of hard and soft work. The model is coded into Group-Work Interaction System by Visual Basic 6.0. The validation of the system is conducted by choosing the group of adjustable parameters to achieve the optimal match of group members with their work resulting in good group behavior and high work efficiency. Many rules and related phenomena are discussed and analyzed in validation, as well as the implication of the system and further works are offered in the end.