The tensile plastic deformation of dendrite-reinforced Ti-based metallic glass composites (MGCs) was investigated. It was found that there exists a critical normalized strain-hardening rate (NSHR) that determines the plastic stability of MGCs: if the NSHR is larger than the critical value, the plastic deformation of the MGCs will be stable, i.e. the necking and strain localization can be effectively suppressed, resulting in homogeneous plastic elongation in MGCs. Meanwhile, dendrite-reinforce MGCs are verified to be intrinsically ductile, and can be use as good coating for improve the surface properties of pure titanium or titanium alloys. These findings are helpful for designing, producing, and using MGCs with excellent performance properties.