By adopting the method of mixing rapid hardening sulphoaluminate cement（R·SAC） with ordinary Portland cement（P·O） to improve the shortcomings of long setting time and low early strength of P·O 3D printing material， the effect of the R·SAC content on its setting time， mechanical property， fluidity and stacking performance was systematically studied. The results show that when the R·SAC content is 14%-20%， R·SAC has obvious effect of accelerating setting， and the setting time of cement paste and mortar has been effectively reduced， the initial setting time of the mixed cement paste can be controlled between 40-70 minutes， which meets the requirements of 3D printing. At the same time， the addition of R·SAC can improve the fluidity of the material. When the R·SAC content is 20%， the fluidity of the mixed cement mortar can be increased by 11 mm and the consistency by 15 mm compared to the P·O mortar. The fluidity of mixed cement mortar can meet the stacking performance requirements of 3D printing materials within 160-175 mm. The addition of a small amount of R·SAC has a certain improvement in the early strength of the mixed cement mortar， but its later strength has been reduced.