Abstract: On the basis of the field inspection in 30 counties of 15 provinces and the observation on plant of collectable 66 seeds share of Chinese s. nigrum complex from 25 provinces, as well as analysis and comparesion of the oversea relative research materials, we put forard domestically the following:(1) From low latitudes to high latitudes (18.6-53.5°N) the four species of Chinese s. nigrum complex respectively belong to diloid, tetraloid, hexaloid;(2) From the southern China to Northern China, natrually form three geographical distributive areas of diloid, the intersect of hexaloid and diloid, as well as the intersect of hexaloid and tetraloid.

Key words: solanum nigrum complex, Diloid, Tetraloid, Hexalaid, Geographic distribution