The anti-tumor active extracts of 5 kinds of medicinal plants were screened, which are Crotalaria mucronata Desv, Piper betle L1, Actephila m errilliana, Homalium paniculiflorum and Homalium hainanensis. The MTT assay was used to test the antitumor activity of the different extracts of 5 kinds of medicinal plants against four kinds of cancer cells in vitro. Some of the extracts showed remarkable inhibitory activities against the four tumor cells, and expressed dose-effect relationship obviously.%筛选猪屎豆、蒌叶、喜光花、广南天料木和红花天料木等5种药用植物的抗肿瘤有效部位．采用MTT法测试了该5种药用植物不同溶剂萃取物对四种癌细胞的体外抑制活性．证明了该5种药用植物的部分提取物对4种肿瘤细胞增殖有较强的抑制作用，量一效关系明显．
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