【正确答案】The reform of retirement insurance system in public institutions has long confronted great obstacles. The direct obstacle is whether the reform is based on fairness. A fair system means that every member of the society should be covered without the exception of any special group who can drift beyond the system and enjoy another type of pension. Of course, coupled with this reform of old-age pension insurance system is another reform, concerning the payment system of the public institutions. In short, any reform must be understood and performed in the context of unified coordination.