Introduction: High-performance liquid chromatography is one of the powerful qualitative and quantitative tech-niques, generally used for the analysis of pharmaceutical preparations. HPLC’s virtue lies in its versatility. We can use it to separate compounds of molecular weights from 54-450000Daltons. Amounts of material to be detected can vary from pictograms and nanograms to micrograms and milligrams to grams depends on which kind of detectors used for chromatographically separations. This article was prepared with an aim to review different aspects of HPLC, such as principle, types, and its applications. Keywords: High performance liquid chromatography, applications, mobile phase, stationary phase

Introduction: Achillea asiatiсa has been used in traditional medicine for one hundreds of years. Many compounds have been isolated from /Achillea asiatica/, including flavonoids, sesquiterpenes and essential oils. Salsola collina herb grows in Siberia, Baikal and Altai. It contains a variety of amino acids, flavonoids, glycosides, and vitamins. It has a positive effect on metabolism of fats in liver, regulates cholesterol and sugar in the blood and is recommended for weight reduction. Salsola collina is widely distributed in droughty and semi-droughty area, which is used as a kind of folk remedy in traditional Chinese and Mpngolian traditional medicine for treatment of hypertension and liver protectevity . Goal: The aim of study is to choose optimal extragent and determination liver protecting activity in Achillea asiatiсa, Salsola colina and to determine main substances in these herbals. Material and Methods: Achillea asiatiсa was collected from Dorgonot mountain Tuv province in June of 2012, Salsola colina were collected from Medicinal botanical garden of Drug Research Institute in August of 2012. Maceration was chosen by suitable extraction method and optimal extragent was ethanol. Flavonoids were determined in evaporated extract of Achillea asiatiсa, Salsola colina using the method by Mongolian National first Pharmacopeia. We use non line wistar rats, determination liver protecting activity biochemical analysis by Hospitex analyzer. Result: Liquid extracts were obtained from Achillea asiatiсa, Salsola colina with maceration method. Liquid extracts were evaporated on Vacuum rotor. The tehnological parameters of liquid extracts are the main important index to calculate the extragent correctly, to establish the material balance exactly, and to extract the process efficiently. 70% ethanol (1:10 sample/extragent) was determined by optimal extragent for Achillea asiatiсa, 80% ethanol (1:10) for Salsola colina. Achillea asiatiсa, Salsola colina were have liver protecting activity. Conclusion: Some technological parameters of liquid extract were determined such as optimal extragent and the effective extracting method of Achillea asiatiсa, Salsola colina. As the result of determining these parameters, it has much practical significant for establishing the technological condition to extract the biological activity compounds completely from their plants. Key words: Achillea asiatiсa, Salsola collina, technological pharameters, flavonoid, anthraquinons, liver protecting activity