Abstract: For the requirement of mold bag concrete to achieve high frost resistance under large flowability, the effects of air content, antifoaming agent and viscosity enhancing agent on the workability and frost resistance of concrete were studied by orthogonal test. The test results show that the air and antifoaming agent contents are significant factors that affect the relative dynamic elastic modulus and the air content of mold bag concrete is significantly greater than antifoaming agent content; the viscosity enhancing agent increases the relative dynamic elastic modulus to a lesser extent. The compounding of antifoaming agent and viscosity enhancing agent can achieve the effects of synergistically improving the workability, pore structure and frost resistance of mold bag concrete. When the air content is 5vol%–6vol%, the compounding of 0.15wt% antifoaming agent and 0.03wt% viscosity enhancing agent can reduce the air content loss rate and the slump flow loss rate by 64.28% and 55.04%, respectively. The number of harmful large bubbles is eliminated by 81.38%. The number of air bubbles is increased by 14.89%,. The spacing factor is decreased by 11.54%. The specific surface area is increased by 20.49%. The relative dynamic elastic modulus is increased by 11.97%. Both the spacing factor and the specific area have a good correlation with the relative dynamic elastic modulus. The frost resistance grade of the mold bag concrete with spacing factor not more than 361 μm and specific surface area not less than 16.13 mm⁻¹ can reach F300. The test results are regressed, and the prediction models of the frost resistence of the mold bag concrete are obtained.