The Microstructure and creep behavior for NiA1-28Cr-5.5Mo-0.5Hf-0. 012P alloy at high temperature were investigated. The results reveal that the high temperature creep behavior of NiA1-28Cr-5.5Mo-0.5Hf-0. 012P alloy is characterized by transient primary creep and dominant steady-state creep as well as high creep strain. The creep mechanisms are dislocation glide at lower testing temperatures in higher stress levels and dislocation climb at higher temperatures in lower stress levels. The microstructure has no change, indicating that the creep fracture is controlled by the formation and propagation of cavities and cracks. Tl,e creep fracture behavior obeys Monkman-Grant relationship ：Intf＋0. 775Inε =1.104.
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