A key to success of high quality software development is to define valid and feasible requirements specification. We have proposed a method of model-driven requirements analysis using Unified Modelling Language (UML). The main feature of our method is to automatically generate a Web user interface prototype from UML requirements analysis model so that we can confirm validity of input/output data for each page and page transition on the system by directly operating the prototype. This paper proposes a data life cycle verification method using a model checking technique UPPAAL. Exhaustive checking improves the quality of requirements analysis model which are validated by the customers through automatically generated prototype.