With the development of seamless connection technology, multimedia applications as the core of the radio technology must meet user networks' requirements for service quality. For heterogeneous wireless networks, switching between different technologies and management domains may occur, and the handoff decisions is no longer based on a parameter but on a multi-attribute synthesis. This paper studies the determination of the weight value of each parameter in multiple attributes. Through the analysis of three kinds of weight assignment methods: analytic hierarchy process, coefficient of variation method and entropy method, the heterogeneous wireless network metrics are evaluated under different business types.