This paper involves the description of medical plants, preparation and quality of raw sources; chemical composition, indicators of application of the medicinal plants in the pharmaceutical industry and determination of vitamin C content on some medicinal plants growing in Kashkadarya basin adyr and mountain ranges. The amount of vitamin C in different vegetation periods in the medicinal plants which antioxidant properties were studied in Mentha, Ziziphora, Melissa, Rubus, Trichodesma, Bunium.