Abstract: Solidified filling material is used in mine underground goaf sealing, which has played a good role in the prevention and control of coal spontaneous combustion. The foam content affects the setting time, fluidity and compressive strength of fast hardening cement. In this paper, the setting time, fluidity and compressive performance of sulphoaluminate cement under different foaming content were studied. The results show that the setting time and fluidity of the sulphoaluminate cement are positively correlated with the water-cement ratio, the initial setting time of the water-cement ratio of 1∶1.4 is 1.6 times to 1.76 times of the initial setting time of the water-cement ratio of 1∶2, and the growth rate of fluidity is from 3% to 43%. When the content of the foam is increased, the setting time of the solidified filling material becomes longer and the fluidity decreases, the decrease of the fluidity of the solidified filling material with the same water-cement ratio of 2 times is the largest and the variation range is 28% to 38%. The pore structure formed by the incorporation of foam into the solidified filling material can improve the compressive performance of the material. After compressive strength peak, the compressive strength of the material can fluctuate up and down within a range of not less than 50% of its peak.