China Pingmei Shenma Energy and Chemical Group Nylon Chemical Company, Pingdingshan 467013)Abstract The equilibrium reaction of 3-pentenenitrile was carried out in the system containing Ni(0), P-ligand and anhydrous ZnCl 2 . The equilibrium state of 3-pentenenitrile was affected by factors such as reaction temperatures and different ligands, which were investigated. The FTIR-ATR was used to monitor the reaction process of 3-pentenenitrile turning into 2-methylglutaronitrile and adiponitrile in absence of HCN and the possible reaction mechanism was proposed.