S. aureus isolate of baohuoside I resistance and YUSA145 was inoculated and cultured to exponential growth phase (OD600 at 0.5) in TSB washed twice with Phosphate Buffer Saline (PBS). Lyse the cells by bead-beating at 4 °C in RIPA lysis buffer (1% Triton X-100, 1% deoxycholate, 0.1% SDS), The protein reduction, alkylation and tryptic digestion were followed as filter-aided sample preparation (FASP). The digestion products were analyzed with liquid chromatography-electrospray ionization-tandem mass spectrometry (LC-ESI-MS/MS), followed by label-free quantitative analysis. The MS experiment was performed on a Q Exactive plus mass spectrometer.