novel trifluoromethyl-substituted pyrimidinederivatives were designed and synthesized, and the bioactivity against four human tumor cells (PC-3, MGC-803, MCF-7 and H1975) was evaluated by MTT assay. Compound 17v displayed potent anti-proliferative activity on H1975 (IC50 = 2.27 μΜ), which was better than the positive control 5-FU (IC50 = 9.37 μΜ). Further biological evaluation studies showed that compound