Around 1980 along with marketability reform's advance, China also started the old-age insurance system's reform. After the 1990s establishment partial fund system, system's switch has brought the unprecedented switch cost and the drive question and so on, this has not brought the serious burden for the wing abundant China old-age insurance system. This article analyzes China old-age insurance system's vicissitude by the economic viewpoint, how has analyzed the different time divergent interest group to promote the old-age insurance system reform, how will influence analyze the special interest group to have in the current situation to the next step reform. One kind of feasible old-age insurance system's choice also waits for further.