Polyaluminocarbosilane was synthesized by direct reaction of polydimethylsilane with aluminum(III)-acetylacetonate in the presence of zeolite catalyst. A fraction of higher molecular weight polycarbosilane was formed due to the binding of aluminium acetylacetonate radicals with the polycarbosilane backbone. Small amount of Si-O-Si bond was observed in the as-prepared polyaluminocarbosilane as the result. Polyaluminocarbosilane fiber was obtained through a melt spinning and was pyrolyzed and sintered into SiC fiber from $1200{sim}2000^{circ}C$ under a controlled atmosphere. The nucleation and growth of ${eta}-SiC$ grains between $1400{sim}1600^{circ}C$ are accompanied with nano pores formation and residual carbon generation. Above $1800^{circ}C$, SiC fiber could be sintered to give a fully crystallized ${eta}-SiC$ with some ${alpha}-SiC$.