Natural products play a critical role in cancer prevention and therapy today. There are numbers of anticancer agents from natural products used in the clinic.Fighting cancers with novel natural products, especially those extracted from plants, is a potential strategy to develop new anticancer drugs..In the following study, various extracts of well known medicinal plants named Holoptelea integrifolia (F), Operculina turpethum (R), Cardiospermem halicacabum L (S), Dilonix regia (F), Sesbania grandifora seed have been studied for evaluating their anticancer activity. Our data showed that the cytotoxic activity of Operculina turpethum (R) ethanolic extractwas relative high for all 6 cancer cell lines as compared to other extracts. The active compound and anticancer mechanism of these extracts are worth investigating in the future.