Model-based quantitative techniques are not commonly used for web service behaviors security evaluation, which have typically been applied to analyze small parts of an overall design. Aiming at the traits of attack behaviors for web services, this paper proposes the hierarchical Stochastic game nets(SGN) model and analysis methods. We give the definitions and important theorems of stochastic game nets, study the modeling algorithm of hierarchical SGN model. A series of simulation results are presented to show that, by applying hierarchical SGN model to describe the attack and defense behaviors in web services, quantifiable results can be successfully obtained for the evaluation of important attributes. Model-based quantitative techniques are not commonly used for web service behaviors security evaluation, which have typically been applied to analyze small parts of an overall design. Aiming at the traits of attack behaviors for web services, this paper viage the hierarchical Stochastic game nets ( SGN) model and analysis methods. We give the definitions and important theorems of stochastic game nets, study the modeling algorithm of hierarchical SGN model. A series of simulation results are presented to show that, by applying hierarchical SGN model to describe the attack and defense behaviors in web services, quantifiable results can be successfully obtained for the evaluation of important attributes.