Bi-substituted gadolinium iron garnet films were deposited on GGG(111) and NGG (111) substrates by irradiating KrF excimer laser onto targets having compositions of $Bi_{x}Gd_{3-x}Fe_{5}O_{12}$ ($2.0{leq}x{leq}3.0$) under substrate temperature of $580~620^{circ}C$. Analysis on structure, composition and angle of Faraday rotation, ${ heta}_{F}$, were carried out. The composition, the structure and the magneto-optical properties of the obtained films were found to be strongly dependent both on the compositions of the targets and on the pressure of oxygen. Before annealing in air, all films showed ${ heta}_{F}{geq}0$ at ${lambda}=6328{AA}$, while several films showed ${ heta}_{F}{leq}0$ after the annealing. The highest value of Bi-substitution up to x = 1.76 with uniform composition was obtained.