This paper examines the impact of financial variables on the time-varying correlation of bond and stock returns. Our empirical finding demonstrates that no matter in time varying normal copula correlation or DCC model, the average correlation is very low in US and Germany. However, the correlation is high in Japan. We further test how financial variables affect the correlation and find an interesting estimated results that the exchange rate, gold and oil exhibit different signs and sizes at quantiles 0.25, 0.5 and 0.75, respectively. In sum, we are unable to find any systematic relationship between financial variables and bond-stock returns correlation.