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Three nickel(II) complexes, [Ni 2 (L 1 ) 2 (tren) 2 (H 2 O)](ClO 4 ) 3 ( 1 ), [NiL 2 (tren) 2 ](ClO 4 )·2.5H 2 O ( 2 ), [NiL 2 (tren) 2 ]I·1.5H 2 O·CH 3 OH ( 3 ) based on amino acid reduced Schiff ligands are synthesized and characterized by physico-chemical and spectroscopic methods. The results show that in all complexes, the amino acid ligand is deprotonated and acts as an anionic ligand. In the dinuclear complex 1 , each Ni(II) atom has a distorted octahedron geometry while with different coordination environment. However, the complexes 2 and 3 are mononuclear, almost with the same coordination environment. Furthermore, in vitro experiments are carried out, including MTT assay, Annexin V/PI flow cytometry and western blotting, to assess whether the complexes have antitumor effect. And the results show that all the three complexes have moderate anticancer activity towards human hepatic cancer (HepG2), human cervical cancer (HeLa) and human prostate (PC3) cell lines, in a concentration dependent way. The complex 1 exhibit higher cytotoxicity than the other two complexes and can induce human hepatic cancer cell (HepG2) to cell apoptosis by activating caspase 3. [ABSTRACT FROM AUTHOR]