Abstract: The microstructure of carbon-aluminum composites is close related with their technological process. Therefore, the problems in the process can be discovered by studying the features of the microstructure, and available information can be obtained further to choose the process parameters correctly, to improve the technological process and to enhance the properties of the fibers and composites.The microstructures of the carbon fibers, the carbon fibers coated with nickle, the carbon fibers with nickle layer after vacuum heat treatment, carbon-aluminum composite wires and their specimens fabricated by hot pressing under the different technological conditions have been taken with the metallographic and sweep electron microscopes and are presented in this paper.