The density ρ and surface tension γ of lithium tetraborate melt have been systematically measured from 1100K up to about 1500K.The experimental results indicate that the melt density and surface tension decreased linearly with increasing temperature.The relationship of Li2Ｏ-２Ｂ２Ｏ３ melt density with temperature is ρ(T)=2.574-4.89×１０－４T.The density of Li2Ｏ-２Ｂ２Ｏ３ melt is 1.992g/cm3 at melting point.The temperature dependence of the surface tension of Li2Ｏ-２Ｂ２Ｏ３ melt is γ=262.8-4.59×10-2T.