I show strength functions and transition densities of even-even medium-heavy nuclei up to neutron drip line calculated using quasiparticle random-phase approximation for a few J^\pi channels. Growth of transition strength is predicted in a low-energy region (Pygmy resonance) as neutron number N approaches the neutron drip line. Three properties are discussed systematically: Enhancement of Pygmy resonance after magic numbers, relation between the strength of Pygmy resonance and radius of ground state, and emitted neutron number obtained from excited-state density distribution.