Abstract: The present paper reports the mitotic chromosome numbers of 9 species of the genus Viola in China, of which 5 species are new records. The res-ults are as follows:V. biflora L. 2n=12; V. kunawarensis Royle 2n=20; V. prionantha Bunge 2n=48; V. tenuicornis W. Bckr. 2n=24; V. monbeigii W.Bckr. 2n=24; V. inconspicua B1. 2n=24; V. bulbosa Maxim. 2n=24; V. dissecta Ledeb. 2n=24; V. chaerophylloides (Regel) W. Bckr. 2n=24.#br#The chromosome numbers of these species correlate with the shapes of their stigma. The chromosome numbers of several species in Sect. Adnatae are 2n=24, only V. prionantha Bunge is 2n=48. V. kunawarcnsis Roylc which was located in Sect. Adnalae in the Past time has a convex style without margin. Its chromosome number 2n=20 is not identical with Sect. Adnalae Juz., too. The authors think that this species should belong to Soct. Tri-gonocarpae Godr. rather than Sect. Adnatae J. Sect. Pinnala (W. Bckr.) C. J. Wang has the same numbers as Sect. Adnatae.