Based on statistical characteristic of the short terra Shibor, this paper constructs a jump diffusion model which matches the short term Shibor well. The empirical results show that the model can explain volatility clustering and jumping behavior of the short term Shibor, and verifies large IPO and unexpected monetary policy adjustment are two main reasons for Shibor jumping.%上海银行间同业拆借利率(Shibor)自运行以来,短期Shibor品种波动异常频繁和剧烈.本文通过对短期Shibor数据的描述和相关统计检验,构建了一个适合其动态特征的ARCH跳跃扩散模型,并通过实证表明,跳跃行为和ARCH效应是描述短期Shibor波动的主要因素.随后结合Shibor运行的宏微观背景,在该模型框架下进行分析,得到大型IPO和未预期到的货币政策调整是导致Shibor跳跃行为的两个主要原因.
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