Abstract: The size, distribution and morphology of carbides in 53Cr21Mn9Ni4N austenitic heat-resistant steel have a significant impact on the material’s properties. Based on the 53Cr21Mn9Ni4N mold cast blanks produced by a certain factory,the carbides were analyzed using optical microscopy, scanning electron microscopy, three-dimensional etching instrument for inclusions, and Thermo-Calc software. The research results show that there are mainly two types of carbide phases in53Cr21Mn9Ni4N steel: one is the M₂₃C₆granular carbide precipitated along the grain boundaries, primarily composed of Fe,Cr, C and Mn elements, with the size mainly concentrated in the range of 2-10 μm; the other is the lamellar carbide formed by the γ phase and M₂₃C₆, consisting of alternating arrangements of carbides and austenite phases, containing Fe, Cr, C, Mn, N elements, with the size concentrated in the range of 10-50 μm. From the edge to the core, both the equivalent diameter and area percentage of the lamellar carbides show an increasing trend. Specifically, the equivalent diameter of the carbides grows from 8.3 μm at the edge to 33.6 μm at the core, and the area percentage increases from 6.70% at the edge to 32.07% at the core, with the aspect ratio of the carbides concentrated between 1.39 and 1.76.