The invention discloses a heat treatment process for avoiding formation of DO3(Fe3Al) in Fe-Mn-Al-C steel, and belongs to the field of special steel heat treatment processing. The steel is heated to 1473K-1573K after hot rolling, the steel is subjected to oil cooling to the room temperature after being kept warm for 10min-1h, the steel is heated to 1173K-1373K, temperature selection avoids the formation of carbide, a ferrite austenite biphasic structure is obtained, water cooling is carried out after being kept warm for 30min-2h, and the heat treatment process as an attached map. According tothe heat treatment process for avoiding the formation of the DO3 in the Fe-Mn-Al-C steel, on the one hand, a DO3 brittle phase can be avoided in the steel, on the other hand, micron order austenite and reticular austenite can be obtained, the heat treatment process can be applied to other applications such as industrial processing, and the heat treatment process has advantages of simple process, low cost and higher engineering value.