Lacking of shelter and care from their children, Chinese lost only-child elderly are impoverished and their mental state compared to older people in general are more fragile and sensitive. They have even united themselves for self-help, while their efforts have been often unhelpful. Their scale has been increasingly expanding and risen to many serious social problems. Appearance of lost only-child old man people and vulnerability of protection for those elderly is mainly due to the faultiness of Birth Control Policy, lack of government finance and imperfect social security system. Chinese government should establish a mechanism to increase and maintain the value of administrative compensations, strengthen administrative pay and protection of administrative contracts, broaden administrative relief channels for the elderly, and effectively protect the pension interests of the lost only-child elderly.