Abstract: In order to make the bolt GH4169 alloy of ultra supercritical generator set have high tensile strength and fatigue performance, it is necessary to obtain the microstructure with small grain size and uniform distribution. The ideal microstructure can be obtained by combining the precipitation of δ phase with the hot working process and reasonably controlling the hot working process parameters. Therefore, mastering The behavior of δ phase precipitation GH4169 alloy is of great significance. Based on the experimental results of δ phase precipitation, the phenomenological model of phase precipitation dynamics has important guiding significance for mastering the δ behavior of phase precipitation.