The volume fraction of coarse aggregate is a key index for the mix ratio design of mold bag concrete. In order to provide some reference for the crack resistance design of mold bag concrete lined channels, the influence of coarse aggregate on the slump flow, compressive strength and drying shrinkage of mold bag concrete is studied when the volume fraction of the aggregate falls in the range of 0.30-0.36. The results show that under the the same water-binder ratio, the overall slump flow of mold bag concrete rises with fluctuations and then stabilizes with the increase of the volume fraction of the coarse aggregate, and the lower the water-binder ratio the larger the slump flow. Under the same water-binder ratio, the volume fraction of coarse aggregate decreases first and then increases the 28 d compressive strength of mold bag concrete, whereas the decrease of water-binder ratio significantly increases the 28 d compressive strength. With the increase of the volume fraction of coarse aggregate, the 28 d drying shrinkage rate of mold bag concrete decreases first and then increases, and the minimum value is reached when the volume fraction is 0.32. The corresponding drying shrinkage rate of the first 7 days can reach more than 50% of the total drying shrinkage rate of 28 d when the volume fraction of coarse aggregate is 0.30,0.34 and 0.36, indicating that the drying shrinkage of the mold bag concrete increases rapidly at the early stage.