<p>As a new type of electrolyte, nanofluidic electrolytes can improve the energy storage and conversion efficiency, which can be used in batteries and electrolysis for hydrogen production, and its preparation and application have attracted the attention of many scholars. However nanoparticles constrain further application of nanofluidic electrolytes due to their instability. Carbon nanotubes, which are stable in nature, were chosen as the dispersant in this paper, carbon nanotube-deionised water nanofluidic electrolytes were prepared. The stability of the nanofluid and its relationship with conductivity was investigated through sedimentation observations and absorbance measurements and analyses. It was shown that: the preparation sequence of preparing nanoparticle dispersion first and then adding CTAB additives could obtain nanofluidic electrolytes with better stability; the smaller the concentration of nanoparticles in the carbon nanotube-deionised water nanofluidic electrolytes, the higher the stability; the additives could effectively increase the dispersive stability of the nanofluidic electrolytes, and the dispersive stabilising effects were CTAB, PVP, and SDS, from high to low.</p>