The performance measurement of enterprise technology alliances is complex. In this article, evaluation mechanism of entropy has been applied to it. Above all, performance connotation of enterprise technology alliance is defined from the aspect of self-organization theory. Then, on dynamic and systema -tical view, an entropy-based overall performance measurement model for technology alliance is established, using its life-cycle as the principal line, which includes initial condition evaluation, process evaluation as well as benefit evaluation. Finally, a case study is carried out to the demonstration of that model. The author believes that an improved performance measurement model based on alliance life-cycle would be practicability to alliance.