Using a sample of China’s listed private firms we investigate the relationship between control-ownership wedge, bank connections and collateral requirement. We find that while control-ownership wedge relates to more pledged collateral, it is mainly the firm’s bank connections rather than its political connections that reduce the collateral requirement and weakens the positive relationship between the control-ownership wedge and collateral. We furhter find that the split-share structure reform and regions with high lender competition also require less collateral and weaken the positive relationship between the control-ownership wedge and collateral. We argue that in an emerging market where legal protection for creditors and investors are weak and relationship is prevalent, bank connections is a substitute for collateral through mitigating the information asymmetry and agency concerns by creditors, which has been further exacerbated due to the tunnelling risk by the controlling shareholders.