Abstract: T-S fuzzy system is widely applied to different data-based modeling methods. As the core of T-S system, the fuzzy rule sets is the most important factor to the precision and generalization of the system, but the number of fuzzy rules is very difficult to determine. Taking account of how these rules are generated in view of cluster subtraction, the cluster radius (CR) affects the number of rules directly. Thus, the uniform design is chosen to set the cluster radius so as to determine the number of rules easier and simplify the modeling of complex multi-variable system. The effectiveness of the method proposed is verified through a simulation example.