Ni/ZSM-5 catalyst is one of the promising catalysts to improve the catalytic steam reforming of waste cooking oil (WCO) for hydrogen production. Furthermore, the introduction of lanthanum (La) plays a huge role in inhibiting metal sintering and carbon deposition and improving the stability and activity of the catalyst. This study investigated the effects of reaction temperature (600-800 oC), steam to carbon molar ratio (S/C), n Ni/ZSM-5 (n=5, 10, and 15 wt%), and the addition of promoter (La) on the experimentally generated hydrogen yield and carbon deposition. Results showed that the experiment used 6 wt% La-10 wt% Ni/ZSM-5 at 0.1 MPa, 700 oC, space-time (τ)=0.56 gcatalysth/gWCO, and S/C=5.25, which obtained the yield of H2 was 154.12 mol/kg, carbon deposition was 5.38%. Therefore, Ni-modified catalyst added La to improve the catalyst coking resistance and prevent carbon formation. Moreover, La can further promote the dispersion of nickel on the surface of the carrier and improve the catalytic performance of the catalyst for steam reforming reaction.