The compositional effect on Physical properties, Optical absorption and Electrical properties of glass composition xK2O - (25-x) Li2O-12.5BaO-12.5MgO-49B2O3-1CuO (x =0, 5, 10, 15, 20 and 25mol %) was prepared by the melt-quenching technique. From optical absorption spectra few parameters, like Urbach energy, indirect allowed, reflection loss (R), refractive index (n), molar polarizability(αm) molar refractivity (Rm), and theoretical optical basicity (Λth) values of prepared glass samples were measured. The values of Rm, αm, and Λth were increase with increasing of x mol%. The Eopt, R, and n values were changed very small with x mol%, which may be due to the non-bridging oxygen’s moments in the glass matrix. The FTIR spectrum of prepared borate glasses indicates that the influence of BO3 and BO4 units of boron atoms. The explicit vibrational peaks were exhibited of Li–O, K–O, Mg–O, and Ba–O bonds in glass network, and A.C conductivity study was devised to know the structural information about the glass network. The drastic change in the ionic conductivity as a function of the alkali content in the glass composition was analyzed by considering both the ionic mobility and the glass structure. Some physical, optical, and electrical values varied non-linearly with the K2O content, which may influence of non- bridging oxygens or mixed alkali effect.