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As one of the most important element in knowledge system, math formulas is playing an important role in web based remote teaching, information publication and academic exchange. However, in current situation, the difficulty of searching formulas is always upsetting. A formula search system is designed in this paper. It is able to implement online math formula input and precise search. The system uses JSP as UI development language, Oracle as background data base and MathML as the description language to math formulas. The design of the online formula edition module enables users to edit math formulas at will. The formulas in this system are stored as MathMLcodes, for which the query to math formulas can be realized by matching mathml codes.