Abstract: According to analyze the characteristic of mold knowledge from the Internet， this paper pits forward a method through altering the template of replying at the forum to get the label， after that， “seven step” is used to build mold ontology on Internet and a kind of semantic search conceptual model is preliminarily put forward. It provides a theoretical and practical basis for search engine of mold knowledge on Internet.

Key words: mold ontology, semanteme, die forum, seven step