The strengthening effect of phosphorus and boron on wrought superalloys is reviewed and discussed. The addition of phosphorus and boron can prolong the rupture life of some wrought superalloys over 3 times, and lowers the constant creep rate by an order of magnitude. By micro-alloying with phosphorus and boron, alloys with extended rupture life are developed, the service temperature of IN718 alloy is enhanced, and the alloys which can be used for a long time at 700℃ with higher combined properties can be developed.