A series of 6-alkoxy-3-aryl-[1,2,4]triazolo[4,3-b][1,2,4,5] tetrazine derivatives is synthesized and evaluated for their antitumor activities. These compounds exhibit potent antiproliferative activities against A549, Bewo, and MCF-7 cells. Molecular docking is performed to study the inhibitor-c-Met kinase interactions, and the results show that 6-ethoxyl-3-phenylethyl-[1,2,4]triazolo[4,3-b][1,2,4,5] tetrazine is potently bound to c-Met kinase with two hydrogen bonds and one pi-pi interaction. Based on these preliminary results, it is thought that compound 6-ethoxyl-3-phenylethyl-[1,2,4]triazolo[4,3-b][1,2,4,5] tetrazine with potent inhibitory activity may be a potential anticancer agent.