Abstract: The types and processing technology of 10.9 grade M36 wind power bolt steel serviced in alpine region are described, and the research progress on low temperature impact properties of high strength steel for wind power bolts is reviewed from the aspects of crystal structure, chemical composition, original structure before quenching and tempering, processing technology before quenching and tempering, and quenching and tempering process. The reason for the lower low temperature impact properties for 10.9 grade wind power bolts produced by cold heading process with hot-rolled wire rod is analyzed. Finally, the measurements improving low temperature impact properties of 10.9 grade wind power bolts produced by cold heading process with SCM440 steel hot rolled wire rod are put forward.