Abstract: Physic nut (Jatropha curcas L .) is a semi-fleshy small tree or large shrub , belonging to Euphorbiaceae family, Jatropha genus, which has highly tolerance to drought and nutrient deficiency . Their roots, barks, leaves and seeds can be used as medicines . The main components are fats, proteins and terpenes, and the toxins are curcin and seed oil in physic nut seed . Oil content of kernel is about 50% , which can be used as biological diesel oil without pollution . Curcin , seed oil and other extracts from physic nut seeds can be used as biological pesticide . There are a little study on development and dehydration behaviour of the seeds, and their regulation . Physic nut is an important strategic resource with great economic value .

Key words: Jatropha curcas,  , Biological diesel oil,