The present invention uses optical active dialkyl alcohol amine to react with (+ or -) -2 -tetrahydrofuran fomic acid in a mixed solvent of ester and alcohol, then utilizes the difference in solubility of the produced a pair of non-enantiomer salt in the solvent and to separate them, and further decomposed by acid or alkali respectively, so as to obtain the optical active 2 -tetrahydrofuran fomic acid. The present invention possesses the characteristics of abundant in resolution agent source, low in cost, simple in processing technology, easy in operation, high in yield and high in optical purity. |