After the parameters of the Candidate MV-GARCH model estimated, T-BEKK model is the optimal model by AIC test and so on, since it captures the features of financial peak time and the tail better.

• 在估计了股市和债市候选MV-GARCH模型参数基础上，通过AIC准则等拟合优度方法选择了t分布型BEKK为最优模型，因为它更好的捕捉到了金融时序尖峰、厚尾的特征。