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Abstract- Now a day’s use of internet becomes very popular. Everyone gets their need by searching on internet. User can access information easily by web searching tools like a search engine. (Google) According to one survey nearly 70 % of the people use a Search Engine to access the information available on Web. If Query submitted by the user to the search engine is too short and ambiguous then it can create problem to getting right documents. Query classification is one technique of Data Mining in query should classify to the number of predefined categories. Query classification use ontology as a model to retrieve the document. Ontology is used in information retrieval system to retrieve more relevant information from a collection of unstructured information source. The main objective of this work is to use ontology concepts as categories. The concepts of ontology will be used as training set. Each document is ranking by the probability. The semantic relations will solve the problem of ambiguity. Web query classification is used to ranking the page(Search engine optimization)