The origin of the charge density wave (CDW) is a long-term open issue. Furthermore, the evolution of phonon-phonon interactions (PPIs) across CDW transitions has rarely been investigated. Whether electron-phonon coupling (EPC) would be weakened or enhanced after CDW transitions is still under debate. Additionally, CDW provides fertile ground for uncovering intriguing intermediate electronic states. Here, we report a Raman spectroscopy study of the PPI and EPC in topological semimetal EuAl