Euthanasia is related with physic,law,philosophy and so on and there are two attitudes towards it. In combination with jurisprudential base,the article analyzed the concept and related issues of euthanasia,pointed out the legality of euthanasia in terms of the value of law,the right of subsistence,the illegality hindered of the subject and the principle of crimes and penalties prescribed by law,then indicated the reasonableness of the practice of euthanasia. Also,some constructions and assumptions were presented to do some efforts to the legislation of euthanasia in China.