Abstract: Sub-critical breeder fuelling actinide series and driven by D-T fusion neutrons can use uranium source effectively.Due to k_eff less than 1 and low blanket power density,it has good safety quality.Because of the strong neutron breeding capability,the breeder can be driven by a small neutron source.With a 50~100 M Wt fusion core,the reactor can produce 1 GWe energy,1000 kg fertile to support 3~4 PW Rs as the same power,and burn actinides produced by 3~4 PW Rs.At the same time,the reactor blanket can also produce sufficient tritium for fusion reaction.