The four-axis cleavage method and twin method are used now as main means in determining C∧Ng of monoclinic pyroxenes and amphiboles. However, these methods can not determined satisfactorily in case mineral's Nm is nearly parallel or method in determination of C∧Ng of these minerals with five-axis universal stage, which not only counteract the weakness of the former meth- od, but also make the determination of the monoclinic pyroxene and am- phibole species more rapid and accurate.