A microfoam clean fracturing fluid was obtained under the acidizing fluid system by using non-ionic surfactant (SCF-18) as thickner, NaHCO3 as foam agent. The property of the system was studied. The results show that the optimum formula of acid clean fracturing fluid was 3% SCF-18 0.5% corrosion inhibitor ATMP 3.6% ammonium chloride 1% glacial acetic acid 0.5%NaHCO3. The microfoam acid clean fracturing fluid system had better temperature resistance and shear resistance performance under the condition of 90℃and 170 s-1 .The storage shear modulus G′was higher than loss shear modulus G″when the temperature below 70 ℃, which demonstrated the fracturing fluid has high viscoelasticity.The sedimentation rates of the seeds at 90℃ in the fracturing fluid was 0.7661mm穝-1, which indicated that the fracturing fluid has a better sand-carrying performance. The viscosity of microfoam clean fracturing fluid decreased 2.84 mPa?s during 40 min when the dosage of kerosene was of 5%.With the crosslinking reaction, the CO2 microfoam can apparently reduce the amount of filtration, the damage to the form and improve the flowback rate. It can be concluded that the effect of microfoam acid clean fracturing fluid system is improved.