Based on analyzing the deformation characteristics of hot forming pipe fittings with A335P92 steel, the hot forming process of A335P92 steel is proposed, which is proved to be feasible by tests and inspection of products. It is shown for the hot forming process of A335P92 steel by tests that the heating temperature is 950~1 100 ℃, the heating preservation time is 1~2 h. In addition, some defects such as flaws will not occur after hot forming between 650 ℃ and 1 100 ℃ even though by water quench, and free cooling is permitted.