Abstract: Bioactive tests show the water soluble alkaloids of Leontice kiangnanensis are effective to adjuvant arthritis in mice. Fifteen alkaloids were isolated from the water soluble alkaloids. On the basis of physical and chemical data,IR,UV,MS, ¹H NMR, ¹³C NMR spectra, seven of they are identified as (-)-5α-hydroxysophocarpine(LK-1),camoensine(LK-2),3α-hydroxylupanine(LK-3),13α-hydroxylupanine(LK-4),caulophylline(LK-5),(-)-7,11-dehydromatrine(LK-6),3β-hydroxylupanine(LK-7).