Euthanasia as a critical issue associated with social ethics,law,medicine,etc.,caused a debate lasted nearly a century,although non-governmental organizations all over the world strived hard to legalize euthanasia legal but countries that made it into legislation is numbered.Case proposed by WangMingCheng about euthanasia in China also caused great debate and whether euthanasia should become legal has become the foucus.From the definition of euthanasia and its decriminalization in law with humanitarian and ethical characteristics,we can see that euthanasia is of high social value,and it should be legalized.