Because the treatment of a physician generally pertains to the intrusion into body of a patient, his/her consent is a must in order for such conduct to be justifiable. To ensure effective consent of a patient, the physician should fully inform him/her of kind and details of the disease and way of treatment and risks associated with it. The patient can, then, make a decision whether he/she should accept any treatment or operation, if necessary, on the basis of such information. The obligation of physicians to explain has since long been recognized as important in view of guaranteeing the rights of patients for self-decision and protecting them from arbitrary assessment of physicians for treatment. Progress has been made in this respect even to the extent that physicians treat patients on equal terms and think first of all much of establishing trustworthy relationships with patients. Lots of studies in Korea and foreign countries have tried to explore the issues concerning the obligation of physicians to explain in the meantime but seem to have failed to make concrete and versatile approaches from the standpoint of protecting the rights of patients. Wouldn't it be really possible for patients to perceive their own rights and cope actively with the medical treatments? If physicians have full understanding to the rights of patients, they will be put in a better situation to protect themselves and patients, in turn, can identify their own responsibility correctly, which will eventually contribute to fulfilling the goal of treatment. With this background, the present paper examines briefly the obligations of physicians for explanation based mainly on the preceding theories and judicial precedents in the first place and then deals with the status quo and contents of the German medical laws, with a focus on the treaty of European Law 1997 and its working document on the applications of genetics for health purposes that stipulate the detailed criteria on the medical treatment and rights of patients and Germany's $\ulcorner$Charter of Rights for Patients$\lrcorner$ promulgated in 2003.