a b s t r a c tIn this paper, we shall establish a unilateral global bifurcation theorem from infinity for a class of p-Laplacian problems. As an application of the above result, we shall study the global behavior of the components of nodal solutions of the following problemMoreover, we give the intervals for the parameter λ which ensure the existence of multiple nodal solutions for the problem if f 0 ∈ (0, +∞) and f ∞ ∈ (0, +∞), where f (s)/ϕ p (s) approaches f 0 and f ∞ as s approaches 0 and ∞, respectively. We use topological methods and nonlinear analysis techniques to prove our main results.