Using the staggered introduction of regional specialized debt recovery courts as a quasi-natural experiment, we estimate the causal effect of law enforcement on financing cost of corporate bonds in China. With primary market issuing data, we show that the introduction of specialized courts reduces issuers’bond financing cost by 15%. The analysis of secondary market trading data confirms the results that the yield spreads of existing bonds reduce significantly. Exploring regional-, firm- and bond-level heterogeneity, we find the effects to be much stronger when ex-ante default risk is high. Our case-level analyses further support that enforcement cost reduction in debt dispute resolution is a channel for the reduction of cost of bond. Our paper has important policy implications in light of the recent bond default wave in China, suggesting that creditors protection through highly efficient law enforcement is important for bond market development and will eventually benefit bond issuers as well.