It is concerned by all sectors of society to the sustainability of social insurance in China. The data from 2012 to 2014 showed that it is not allowed optimistic about the sustainability of social insurance in China. Study showed that major challenges was faced by sustainability of basic pension insurance and basic medical insurance，and sustainability of work injury insurance，unemployment insurance，maternity insurance is stable as a whole. The unbalance problem between provinces about sustainability of social insurance is rather obvious，and some measures should be taken to deal with that situation.