Disclosed is a method for producing a tris tricarboxylic acid (alkyl-substituted cyclohexyl amide), a tricarboxylic acid and an alkyl-substituted cyclohexylamine, in the presence of (a) boric acid compound and phenol compound, or ( b) boric acid compound and a phenol compound under borate exists obtained by dehydration condensation, subjected to amidation reaction, if necessary, a method in which comprises purifying the obtained crude product.