An　Fe-18Ni-12Cr-based　alumina-forming　austenitic　(AFA)　steel　with　simple　alloy　design　free　of　Nb　and　C　was　developed　for　potential　application　in　advanced　ultra-supercritical　power　plants.　Creep　behavior　of　the　material　was　studied　at　the　target　application　temperature　of　700　degrees　C.　Creep　properties　were　analyzed　in　terms　of　stress　exponent　(n),　Monkman-Grant　relationship　and　creep　damage　tolerance　factor　(lambda).　The　microstructural　evolution　of　crept　samples　was　investigated　by　scanning　electron　microscope　(SEM),　electron　back　scatter　diffraction　(EBSD)　and　transmission　electron　microscope　(TEM).　The　minimum　creep　rate　decreased　from　5.8　x　10(-8)　to　1.6　x　10(-9)　1/s　with　the　applied　stress　decreasing　from　140　to　80　MPa.　Precipitation　of　B2-NiAl　during　the　prolonged　creep　process　contributed　to　improve　creep　resistance　of　the　material.　The　related　creep　mechanism　was　found　to　be　dislocation　creep,　which　was　supported　by　the　value　of　n　=　7.0　and　by　the　crept　microstructure　of　dislocations　tangled　with　precipitations.　Characterization　results　of　creep　fracture　morphology　indicate　that　the　creep　failure　was　resulted　from　microstructural　degradation　of　precipitation　coarsening.