The purpose of this paper is to study effects of accelerated-aging tests on properties of urea resin-bonded particleboard and phenolic OSB. The results of accelerated-aging tests shown that the mechanical properties of urea resinbonded particleboard decreased and the water-absorbing thickness swelling increased. The APA D-5 test among 5 accelerated-aging tests has the largest effect on properties of urea resin-bonded particleboard. The accelerated-aging tests have larger effect on MOE of particleboard and OSB than on MOR.