Carbon nanotubes are thought of as a promising materials for the event of excessive efficiency concrete. So as to examine the results of Multi walled carbon nanotubes (MWCNTs) content material, water cement ratio and addition methodology on the mechanical properties and microstructure of cement-based composites, specimens with MWCNTs content material of 0%, 0.05%, 0.08%, 0.10%, 0.15%, 0.20%, and 0.30% have been ready when the water cement ratio was 0.25, 0.3, 0.35, and 0.4, respectively. The bodily properties, mechanical properties and microstructure have been examined. The take a look at outcomes present that with the rise of MWCNTs content material, the flexural energy and compressive energy of cement-based composites improve first after which lower. The DIC take a look at exhibits that the displacement and pressure of the specimen with MWCNTs are smaller than the clean pattern below the identical concentrated load, whereas it’s reverse earlier than the failure of pattern. The SEM take a look at exhibits that MWCNTs play the function of bridging and filling within the matrix. The EDS evaluation outcomes present that the 5 essential parts of carbon, oxygen, aluminum, silicon, and calcium within the composite are evenly distributed within the cement matrix.