According to the analytical expression of Shliomis volume of magnetic fluid,the influence of concentrations of magnetic nanoparticles,ambient temperature and external magnetic field on Shliomis volume were analyzed theoretically and calculated numerically.The results show that Shliomis volume increases with the increase of concentration of magnetic nanoparticles,decreases with the increase of ambient temperature(tends to saturate when the temperature is far beyond the melting point of magnetic fluid).The Shliomis volume of magnetic fluid also depends on the magnetic field's direction and strength.The viscosity of magnetic fluid is critical to the Shliomis volume.The result is helpful for studying the magnetic moment relaxation of nanoparticles within the magnetic fluid.