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China has implemented the part funded system of pension project management, but the personal part of pension account has been empty running since the reform, 1997. The problem cannot be solved in short term, and the old-age pension system still be supported by the pay-as-you-go (PAYG in short) system account. So the research of PAYG system is significant. Different from these former papers, this paper takes the perspective of the entire economies, constructs an endogenous g rowth model, tries to find the path of how population aging affects the pension tax rate and discusses whether the PAYG system can result in a payment crisis. Conclusions show that in a short time, the multiple of unit worker's output is a single factor to determine the pension tax rate, so the PAYG sy stem would not have a payment crisis in short term; in a long time, population aging affects pension tax rate under the influence of savings rate. The aggravation of population aging causes a decline in savings rate, and then the pension tax rate increases. There is a positive correlation between the p ension tax rate and the estate transfer rate, education investment rate. And also, the pension tax rate has an inhibitory effect on the decreasing of savings rate. In that way, the rising extent of pension tax ra te would be reduced. Pension tax rate has the function of automatic stabilizers and long-term aging of the population does not necessarily lead to the occurrence of PAYG system payments crisis.

Can Pay-as-you-go System Trigger Payment Crisis in China