While conducting text mining on Chinese content, Internet slang is a problem which results in a lower accuracy of text segmentation. Translating Internet slang into formal Chinese would help segmentation and, in addition, revealing the implicit information of the slang. In order to translate Internet slang, this study first collected meanings of slangs and web texts. Next, Internet slang was categorized, and translating methods, which are mainly based on decision tree and bi-gram language model, were developed for each category. The translator was then implemented. Eighty-one percentages of the Internet slang in web texts were correctly detected and translated, with a precision at ninety percentages. It is concluded that the proposed methods are quite applicable to Internet slang translation.