Accessing the Internet and emphasizing health are two of the most popular trends in recent years. Several health websites or systems were being constructed one after another. In this paper, we implemented a healthcare inference engine for supporting users who has concerns about their own physical conditions. Our research applied a novel weighting model which based on two features of weight which were uniqueness and dominance. Moreover, three parameters were assigned to measure the effect from adding the hierarchy levels of body parts into our methods. In sum, great improvement could be seen after applying body parts hierarchy levels and this healthcare inference engine could performed successfully in real cases.