Objective To adapt the 2020 Basel Assessment of Adherence to Immunosuppressive Medications Scale (BAASIS) accor-ding to culture，and to provide effective tool assessing drug compliance of patients after organ transplantation in China. Methods After obtaining permission from the author of the original scale, the 2020 English version of the BAASIS was translated and adapted across cultures according to guidelines and clinical practice. Then a total of 475 patients after liver or kidney transplantation were investigated using the adjusted Chinese version BAASIS, and its reliability and validity were analyzed． Results The final 2020 Chinese version BAASIS was consisted of 10 items, its Cronbach′s α coefficient was 0.755, the test-retest reliability coefficient was 0.876, and the content validity index of the scale and each item was 1.000. Four common factors were extracted via exploratory factor analysis, which explained 83.507% of the total variance. Confirmatory factor analysis showed that, χ2/df=3.64, RMR=0.01, GFI=0.93, AGFI=0.86, RMSEA=0.11, CFI=0.96, TLI=0.94. Conclusion The 2020 Chinese version BAASIS has the same reliability and validity as the original scale, its items are easy to use and understand, so it can be used to assess medication compliance for the patients after organ transplantation in China.