Abstract:According to the data [1-2] of the National Cancer Center, China has more than 4.06 million new cancer cases and 2.41 million deaths every year, and the incidence rate and mortality of cancer are on the rise. Terminal cancer patients and their families often face decision-making difficulties in end-of-life life sustaining treatment (LST). Due to the frequent loss of decision-making ability in the terminal stage of patients, family members are forced to make decisions on their behalf. In this context, patients' decision-making preferences are unclear, and proxy decision-makers face ethical dilemmas and decision-making conflicts. Patients may accept medical measures that go against their will, resulting in a loss of life dignity, a decrease in the quality of death, and family members are prone to decision regret.