If you have rural hukou you are entitled to a piece of land for building a home and a piece of land for farming. But it is possible that you could have sold off these rights. In cities there is 低保 https://baike.baidu.com/item/%E4%BD%8E%E4%BF%9D If you are really resourceful you may be able to survive on it. But if you are really resourceful you are unlikely to need it in the first place.