The foundation of medical aid should be set up in public hospital has been specific mentioned the very first time at the National Hygienical Conference in 2006. The building of medical charity aid foundation has very important practical and immediate significance. It can solve a lot of current problems which bothered a lot such as the owing fee problem in public hospitals， bringing significant help to the weak crowd. It also can conform the international common practices， for the need to construct the platform to make charitable found helps the weak medical treatwent crowd get medical aid， solving the problem that the hospital has no way to benefit from the medical foundation which is built by civil administration， building the good impression for the public hospitals. Besides it can provide channel for legal support. The article analyses the possibilities of building the foundation and the major difficulties which we will face at. A series of tentative plan such as establishing，managing and collecting the foundation are brought forward.