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The results of the influence of carbon nanotubes (CNTs) doping on lattice parameters, the critical temperature and electrical resistivity in MgB2 superconductor are reported. The synthesis road for MgB2 was mechanical milling of all material components which followed by a solid-state reaction at a temperature of 800°C for 1 hour in the open air. Structurally, the CNTs addition for MgB2 was found to decrease the unit cell volume due to a decrease in the a-axis value from 3.086 Å to 3.078 and 3.074 Å when doped with 5 wt.% and 10 wt.% CNTs respectively. The change in structural constants was also accompanied by a modification in the critical temperature of the sample materials which were 39.20 and 38.02 K respectively as evaluated by the cryogenic magnet. In this report, we discuss phase evaluation by a quantitative XRD analysis, the microstructure of doped materials and their respective resistivity value as a function of temperature varied from 5 K to room temperature.