Concerning the business architecture as the center of the enterprise architecture development,an iterative modeling method was proposed based on the ROAD meta-architecture for open group architecture framework (TOGAF) business architectures through dividing an ACF business architecture meta-model into four parts mapping different kinds of description models,so that the TOGAF business architecture can be modeled with a set of simple and definite model combinations for the further application architecture and information system architecture to follow a clear requirement.Furthermore,a simplified smart bracelet system for amusement park was taken as an example to illustrate the modeling process of TOGAF business architectures based on the ROAD meta-architecture.