We are still doing research on 30 kind of ephemeral and perennialgramineous, bosk and wooded in our country. Nation`s enterprise in industries importing essential oils from abroad and they are using in product of medicine, food and beauty. Whole world`s most of them still researching and using widely Mentha L (Horsemint) plant in crop production and if we naturalize this Mentha L it will show result good result in plant raw material of nature and important to our economy as well.Key words: Mentha longifolia; Menth arvensis, Biological characterIntroductionEach year resource availability of raw material is proved to be not enough and it shows in research of resource in medical plant range and also what plant shows low resourceof raw material has to provide before the plant germinate or during fl owering stage in every year. Nowadays this plant is destroying and possibility of grow again is decreasing, because of the people who has interest in profi t they are taking away a lot of rhizome roots. The result of 100 scrip in Mongolian medicine shows that we supplied 43.75% of raw material in plants are from our fl ora and 56.25% is from other country. So it shows bad affect to our economy that still using other country`s resource and getting import from them. Then we have naturalize the plants in our weather conditions and try to detect innovative biological active ingredients and do research that has explained by modern science. Mongolian medicine need phytogenic of rareplants from other foreign country, so that`s why we are still doing research on how to naturalize plants in our country.Goal: How to plant Metha L. (Horsemint) in fi eld area that in order to determine the nature this plant and next try to know purpose under the following main objectives. There are:1. To recognize the naturalizing plant division2. To identify the qualifi cation of naturalizing plant division and do research ratio with anatomical result3. Get recognition of the importance in Metha L. (Horsemint)Materials and methodsThings that involved in research (blossom) take middle leaf and in order to prepare slice for anatomy research, cut the middle of leaf, get in foam plastic sponge and cut it, blue, paint it with sapphire, put it on the glass shelf make jelly and in order to prepare slice done with 8-10 frequency. According to traditional method with the help of “Enaval” microscope research leaf’s inside anatomy and textural fi nished (Гзырян,1981; Эзау 1980; В.К.Василевская,А.А.Бутник, 1981; Гамалей, 1984). The plants leaf that involved in research anatomy picturedwith the help of “PA-4”that camera.