With the rapid development of technologies such as 5G/6G and the Internet of Things (IoT), consumer electronics have been given the ability to access the Internet and intelligence to a certain extent. Due to such a trend, massive consumer electronics are now in the network and the number still grows exponentially, which reduces the consumer experience and the service provision quality greatly. In order to address the above challenges for consumer applications, we first introduce the concept of Network Function Virtualization (NFV) which tries to abstract the network functions as software that is referred to as the Virtual Network Function (VNF). By composing VNFs in strict order, the service chain can be flexibly customized and provided, so as to satisfy various kinds of service demands from consumers. Nevertheless, limited by the upper resource in the network, the VNF chaining process for the service chain is restricted, under which it also becomes difficult to ensure service quality. In this regard, this work aims to chain VNFs by proposing a preference-based routing mechanism to guarantee the interconnection among VNFs, so as to ensure the service provision process and quality for consumers. In particular, the core is to map the dependence function of VNF instance utilization to the consumer preference, so that the routing path can be calculated to satisfy consumer needs differently. Then, the proposed mechanism is evaluated comprehensively and the results show that the proposed mechanism outperforms the state-of-the-art methods in terms of service acceptance rate, average utilization rate of active VNF instances, etc.