The legal relationship of medical insurance refers to relationship of rightsand obligations among subjects of medical insurance, namely relation-ship of rights and obligations formed among the insurer, the applicant,the insured and the beneficiary of medical insurance due to payment ofmedical insurance premiums and management and supervision of medical in-surance fund. Only if the range of the insured serving as the subject of rights insuch legal relationship, namely the insurant enjoying basic medical insurance, isdefined can the legal relationship of basic medical insurance be better adapted toand values and goals of legal system of basic medical insurance be realized.