OBJECTIVE： To analyze chemical components as coumarin in Saposhnikovia divaricata， and to provide reference for comprehensive analysis of pharmacodynamic material base in S. divaricata. METHODS： UPLC-Q-TOF-MS method was adopted. Chromatographic condition： the determination was performed on ACQUITY UPLC BEH C18 column with mobile phase consisted of 0.1％ formic acid water-0.1％ formic acid acetonitrile （gradient elution） at the flow rate of 0.3 mL/min. The column temperature was 35 ℃， and sample size was 3 μL. MS condition： ESI， in positive and negative ion mode， ESI+/ESI－ 5 500 V/－4 500 V， declustering potential of 80-－80 V， auxiliary heating gas pressure of 55.00 psi， atomizing gas pressure of －55 psi， curtain gas pressure of －35.00 psi， desolvent temperature of 550 ℃， collision activation scanning energy of 15 eV， collision voltage of 35 psi. Component analysis was performed by comparing with the related literature data and the standard chromatogram control combined with accurate relative molecular mass of compounds provided by UPLC-Q-TOF-MS. RESULTS： Totally 135 chemical components were analyzed in ESI+ mode， and the 105 chemical components were analyzed in ESI－ mode. 11 chemical components as coumarin were identified in ESI+ mode， such as isoimperatorin， umbelliferone， scopolamine， xanthotoxin， psoralen， Ostenol， fraxidin， isoimperatorin， 5-hydroxyl-8-methoxypsoralen， phellopterin， decursin. CONCLUSIONS： The method is accurate and rapid， and can be used for the analysis of chemical components as coumarin in S. divaricata.