Objective To provide a basis for quality control and development and utilization,the content determination of thymol and thymyl isobutyrate of Inula nervosa Wall from different parts,different habitats and different harvest periods were carried.Methods Inula nervosa Wall was extracted with 95% ethanol and tested by HPLC.Column C18(Column 200 mm×4.6 mm,5 μm) was used with the mobile phase of mixture of acetonitrile and water(65:35),the flow rate was 1.0 mL/min,the detection wavelength was 220 nm,the column temperature was 25 ℃.Results Th...