PURPOSE: A method for joining aluminum preform is provided to enhance the initial adhesive power and durability, to improve the working environment and to reduce the processing cost without employing the acid treatment by using an organic primary amine silane. CONSTITUTION: The method comprises the steps of dipping the surface of aluminum preform to be joined into an organic primary amine silane aqueous solution for 10-30 min; washing the aluminum preform; leaving it at a 50-70 deg.C for about 30-90 min; coating an adhesive to it; and adhering it to another aluminum matter. The organic primary amine silane aqueous solution is prepared by mixing 1-5 vol% of a primary amine silane; 25 vol% of methanol; and 70-75 vol% of distilled water, and stirring the mixture homogeneously. Preferably the organic primary amine silane is triethoxypropylamine silane.
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