Flaccidity syndrome can be divided into types of invasion of pathogenic heat, invasion of pathogenic dampheat, asthenia of the spleen and stomach and deficiency of the liver and kidney according to the fact that whether the onset is sudden or slow and clinical manifestations in syndrome differentiation. Sudden onset with concurrent chills, fever, etc., followed by flaccidity of feet, or paralysis of limbs belong to pathogenic heat consuming body fluid; flaccidity of lower limbs, slight edema and numbness of dorsum of the foot, accompanied by yellowish urine, yellowish and greasy fur pertain to excessive invasive dampness and heat on most occasions; long course, gradual appearance of flaccidity of lower limbs as well as muscular atrophy belong to asthenia of the spleen and stomach; concurrent lassitude of lumbus and knees, dizziness and enuresis pertain to deficiency of the spleen and kidney.