The starch- based aqueous polymer isocycante（API）gluelam bonding as the research object，with tensile shear strength as a key evaluation index，accelerated aging tests on gluelam bonding to study damage mode and failure mechanism of the bonding The results show that：the adhesive fracture properties of ductile fracture structure，and with the increase of aging time，the damage mode of the bonding transforms form cohesion damage mode to the integrated mode of cohesion damage and interface damage. In the early stage of the aging tests，the effect of temperature on the tensile shear strength is more important；however，with the increase of aging time，the effect of humidity on tensile shear strength becomes more important.