The effects of viscosity and elasticity on the proppant settling velocity of clean fracturing fluid with low viscosity were studied. The fracturing fluid was composed of 2% KCl and 4% main agent including octadecyl 2-hydroxyethyl methyl ammonium bromide，isopropyl alcohol，adjacent hydroxyl sodium benzoate and water. The effect of surfactant，salt and Na₂CO₃ on the viscosity and proppant settling velocity of fracturing fluid and that on the correlation of Stoke ’s static settling formula was analyzed. At the same time，the relationship between settling velocity of fracturing fluid and elastic modulus ( G') and viscous modulus (G") was studied with different dosage of Na₂CO₃. Experiment results showed that at the condition of room temperature and some proppant ，the effect of the concentration of main agent ，CDEA ，KCl，NH₄Cl ，CaCl₂ and Na₂CO₃ on the relationship between viscosity of fracturing fluid and proppant settling velocity coincided with the law of Stoke ’s static settling. When the concentration of sodium dodecyl sulfate was greater than or equal to 6.25% or that of EDTA was less than or equal to 0.2% ，the relationship between viscosity of fracturing fluid and suspended sand was opposite to Stoke’s sand sinking law. When the pH value of fracturing fluid was 10，with increasing ABS concentration，the relationship between viscosity of fracturing fluid and suspended sand was contrary to Stoke’s sand sinking law completely. When the concentration of Na₂CO₃ increased ，the viscosity of fracturing fluid increased first and then decreased ，the proppant settling rate decreased first and then increased ，and G'/ G" increased first and then decreased. The suspended sand performance of surfactant fracturing fluid was not only related to the liquid viscosity，but also related to its elasticity. The elastic contribution to the liquid suspended sand was the largest.