Abstract: The Chinese-script type carbides in cast Ni-base superalloys are considered detrimental to mechanical properties. Controlling the MC carbides, therefore, has been the main concern of metallurgists. A review of the literature has been shown that most previous studies on carbide in superalloys were confined to equiaxed and directionally solidified dendritic structures, and there is a lack of systematic study on the growth behavior of carbides under other solidification conditions. The intent of this paper is to present research on the corbide growth behaviors with various solid-liquid interfacial morphologies using directional solidification techniques, with the aim of improving the mechanical properties of the alloy by controlling the solidification parameters. The following results were obtained:（ 1 ） In directionally solidified alloys with a planar interface, the precipitated MC carbides usually had an octahedral block appearance; with a cellular interface, an elongated or fishbone type precipitate was observed; the morphology changed to an anchor type during cellular-dendritic growth; and a highly developed Chinese-script and complete petal type morphology was observed during dendritic growth.（2） During the transition from a planar to a dendritic interface, the volume fraction of MC corbides increased significantly with the increase of cooling rate.Based on the results of this experiment, a growth mechanism of MC carbides from the melt has been proposed. It is considerd that the segregation behavior of elements in the interdendritic liquid is the controlling factor for the subsequent nucleation and growth of the MC carbides. It is therefore necessary to control the formation of MC carbide through controlling the growth morphology of primary r phase and the interdendritic microsegregation. By adjusting the cooling rate this goal can be achieved conveniently and practically.