In this paper,the results of exploration macrostructure and microstructure of continuous cast copper bars are shown. Quantitative parameters of copper cast bars depending on the speed of continuous casting are rated. It is fixed that independent of speed of casting the macrocrystalline columnar structure consisting of four zones is formed. By means of raster electron microscopy,the microstructure of cast copper is studied. It is determined that the accumulations of eutectic Cu-Cu2O in the form of lines and gas pores by size from 2 to 35 microns at the boundaries grain are observed. With the use of the transmission electron microscope,specific dislocation configuration on cast copper sub-boundary grains is determined. It indicates to high-temperature strain of cupper in the course of cast bar solidification. The important finding can be used for the design technology of copper continuous casting and plastic working of cast bars. In this paper, the results of exploring macrostructure and microstructure of continuous cast copper bars are shown. Quantitative parameters of copper cast bars depending on the speed of continuous casting are rated. It is fixed that independent of speed of casting of the macrocrystalline columnar structure consisting of four is is formed by the microstructure of cast copper is studied. The is determined that the accumulations of eutectic Cu-Cu2O in the form of lines and gas pores by size from 2 to 35 microns at the boundaries grain With the use of the transmission electron microscope, specific dislocation configuration on cast copper sub-boundary grains is determined. It indicates to high-temperature strain of cupper in the course of cast bar solidification. The important finding can be used for the the design technology of copper continuous casting and plastic working of cast bars.