Taking the technical requirements for the dynamicity and flexibility of software system in open network environment as cut-in points, this paper put forward a novel dynamic component model named SoftMan component (SMC) which was well-formed and evolvable. And then a distributed multi-task collaboration mechanism based on game theory in SoftMan component dynamic evolution system is put forward in order to maximize the utilization of computing resources and resolve multi-tasks collaboration problem. Three kinds of experiments are designed to test the feasibility, robustness and performance of distributed multi-tasks collaboration mechanism. Results show that distributed multi-tasks collaboration mechanism based on game theory has a higher successrate and accuracy with good algorithm stability and reliability.