OBJECTIVE： To establish the method for simultaneous determination of tenacissoside A， tenacissoside H and tenacissoside I in Marsdenia tenacissima. METHODS： UPLC-MS/MS method was adopted. The determination was performed on a Phenomenex Kinetex XB-C18 column with mobile phase consisted of 0.1％ formic acid solution-acetonitrile （gradient elution） at the flow rate of 0.2 mL/min. The column temperature was set at 40 ℃， and sample size was 5 μL. Multiple reaction monitoring （MRM） mode was adopted with electrospray ion source as ion source， using positive ion scanning. Source jet voltage was 5 500 V， nebulizer pressure was 60 psi， heating pressure was 60 psi， curtain pressure was 20 psi and cone temp was set at 600 ℃. RESULTS： The linear ranges of tenacissoside A， tenacissoside H and tenacissoside I were 0.1-10 ng/mL （r＝0.999 7）， 0.025-10 ng/mL（r＝0.999 5）， 0.025-10 ng/mL（r＝0.998 9）， respectively； limited of quantation were 0.1，0.025，0.025 ng/mL，limited of detection were 0.05，0.012 5，0.012 5 ng/mL， respectively； RSDs of precision， stability and reproducibility tests were＜4.0％. The recoveries were 97.67％-99.00％（RSD＝0.47％，n＝6）， 95.00％-101.67％（RSD＝2.59％，n＝6）， 96.67％-103.33％（RSD＝2.83％，n＝6）. CONCLUSIONS： The method is simple， precise， stable and reproducible， and can be used for simultaneous determination of tenacissoside A， tenacissoside H and tenacissoside I in M. tenacissima.