The statistical-mechanical entropy of scalar field is calculated by using brick wall method and thin film brick-wall method in Gibbons-Maeda black hole spacetime. The entropy obtained from brick-wall method has two terms. One term is proportional to the event horizon area, and the proportional coefficient is 1/4 when the cutoff factor satisfies a suitable condition. The other term is logarithmic-divergent. The entropy obtained from thin film brick-wall method has only one term which is proportional to the event horizon area, and the logarithmic divergence vanishes.