Through taking a medical oath (Hippocratic Oath), physician swears to save the patient’s life and wait for a bright future in the seat of a doctor with full satisfaction from all the times he has passed. Medicine is a profession which is responsible for “treatment of the patient”. Through this job, the physicians are faced with different people from different sexual, social and age groups during a routine day. Though these people are not all the same person, a physician calls them all as a common title of “patient”. The patient also knows that he can indeed trust the physician and explain every problem of himself to the physician. Upon this trust, the patient can convince himself to let the physician decide about his health. A real diagnosis and treatment is possible just in case the physician is fully instructed about the necessary skills related to the patients, people and society, and is completely familiar with his society, its social behavior, rites, traditions and culture as well. The relationship between a physician and his patient must be in a way that the patient is optimistically encouraged to continue the treatment process. A correct doctor-patient relationship and an appropriate emotional atmosphere in this regard can play the role of an effective motive for the patient to follow the medical treatment process and to change his behavior in order to achieve the best result. The benefits of the patient consent from his doctor-patient relationship have been described well within the studies. The relationship between a physician and a patient should be in a way that the quadruplet essential principles of medical ethics concerning the patient rights is not ignored; it means that upon these principles, the right of the patient to make decision about the efficacy or inefficacy of the role of the selected physician in his treatment and administration of justice are achieved throughout all related fields.All attributes of a physician can be categorized into one of these four groups and so every feature of a physician can contribute towards following every one of these principles.The main objective of this research is to study the degree of the behavioral and ethical role of a physician in following the medical treatment plan by the patient during a treatment. The research is a cross-sectional study which has been done in Shiraz University of Medical Sciences in 1387. With regard to the four essential principles of medical ethics concerning the patients’ rights that is, justice, beneficence Non-malfeasance and autonomy, every attribute of a physician is classified under one of these four principles.With regard to these principles, the four questionnaire principles prepared and distributed among medical students of the clinical section and the patients and the result were analyzed using statistical tests and showed that, administration of justice by the physician is considered as the most important factor in decreasing the disobedience of the patient from doctors’ orders in the opinion of both physicians and patients. The physicians’ belief in the patients’ autonomy 37% and the patients’ belief in beneficence of the doctor’s treatment plan 43.5% are the other major factors respectively among all criterions related to justice; to chose the best and the most affordable treatment plan and liability of the physician dedicated the highest statistical number to themselves consecutively by physician and patients. In this research, no relationship is found between the four mentioned principles of medical ethics and population attributes of the examinees like age and education but a significant relationship were found between gender and the belief in the role of justice in decreasing the disobedience of the patient.