Abstract: We addressed the upgrading of the heavily used toilet system in public hospital,where problems pile up,including but not limited to the huge waste of tap-water,cross-infection/contamination of medical environment,spreading of diseases,secondary contamination of sewage and waste-water systems.The high-tech solution is vacuum toilet system.The discussions,with a specific application example in a hospital of Tianjin,focused on the advantages,including: i) Significant saving of tap-water by 52.1%,from 225.7 t/d to 108.2 t/d; ii) Negative pressure isolates the spreading in air of stinking odor and infestious virus; iii) Prevention of bacteria breeding and secondary contamination of sewage and waste-water systems because excrement-containing sewage was collected,separated,disinfected and discharged on the same floor.Moreover,the problems,including the loud noises and frequent clogging-up of drainage pipe,and their possible solutions as well were tentatively discussed in a thought provoking way.