Qazvin state with area about 1.58 million hectares has a lot of difference vegetation, because of climatic and tophography variations. It has different elevation (above sea level) from 300 m in Tarom to 4140 m in Alborz Mountains. In general this zone has about 61% mountainous regions.Alamut district is famous in respect of medicinal plants growth, because it has one of the most famous areas in growing and harvesting from the natural rangelands of the medicinal plants, in the time of hassan sabbah.The research project of collection and identification of medicinal plants of Qazvin state was studied during 1994- 1997 and 250 species of medicinal plants collected and identified some of these species have limited growing locations i.e: Valeriana officinalis, Papaver bracteatum, Nepeta pogonosperma, Ziziphus Vulgaris but Achillea mellifolium, Rheum ribes is distributed in the width areas. Echium amoenum which is cultivated in some of Alamuts villages and Heracleum persicum are well- known in Irans traditional bazar. More than 40 species of medicinal plants are collected by villages and brought to bazar.