Considering the insufficient information used in interest model on mobile platform, we proposed a novel Interest Model (IM) with contextual information. Composite analysis is giving to the contextual information on mobile platform. Continually, an algorithm for contextual information matching based on Case-Based Reasoning (CBR) was raised. Presented hierarchical interest ontology with semantic relationship based on Open Dictionary Project (ODP). Meanwhile, proposed a method to model updating based on Spreading Activation Theory. The experiment showed that the IM could significantly improve the user experience.