A high-performance liquid chromatography method coupled with diode array detection (HPLC-DAD) was developed for simultaneous determination of two coumarins and eight flavonoids in Lophatherum gracile Brongn (Gramineae), namely 5-O-coumaroylquinic acid (i), 4-O-coumaroylquinic acid (ii), luteolin 6-C-β-d-galactopyranosiduronic acid (1→2)-β-d-glucopyranoside (iii), 7-O-β-d-glucopyranosyl-6-C-α-l-arabinopy ranoside (iv), isoorientin (v), swertiajaponin (vi), luteolin 6-C-β-d-galactopyranosiduronic acid (1→2)-α-l-arabinopyranoside (vii), Saponaretin (viii), swertisin (ix) and apigenin 6-C-β-d-galactopyranosiduronic acid (1→2)-α-l-arabinopyranoside (x). The analysis was performed on Cosmosil MS-IIⅡ C18 column (250 × 4.6 mm, 5 µm) with gradient elution of 0.1% aqueous acetic acid and acetonitrile. The detection wavelength was 330 nm. The developed method was able to determine the bioactive compounds with excellent resolution, precision and recovery. The validated method was successfully applied for the analysis of the 10 bioactive compounds in n samples from different cultivated regions. The results indicated that the developed method can be used as a suitable quality control method for L. gracile.