Abstract: From the point of view for environment modeling, a service environment model was proposed to meet the continuous optimization execution of software services in their life cycle. On the basis of Pareto dominance, services were selected by their multiple quality criteria from bottom to top to form a minimal exhaustive service set (optimal service environment) for all executing instances. The continuous support of optimization execution of software services was realized by dynamically updating the optimal service environment with service changing. The definition of service environment model was given, and so were the methods for initially constructing and dynamically updating the optimal service environment. Experimental results indicated the validity of the proposed service environment model.