Three Cis-Platinum (II) complexes of amines (L) have been prepared and structurally characterized and activity determined, where L is hexamethlene-diamine, hexamethylene-tetramine and pyridine. Crystal structure of [Pt(H2O)3Cl(C6H12N4)]Cl was determinated by x-ray single analysis, indicating that it is a cis-compound. The result of antitumor activity assay indicated that complexes 1~3 strongly inhibit the growth of several human solid carcinoma cell lines. Their anti-tumor activities are possibly related to...