Summary: The project of this study is to research the feasibility of anammox sludge enrichment with endogenous denitrification method and the characteristics of the enrichment anammox sludge. SBR was used as reactor which operation mode of continuously influent when operation would benefit for anammox reaction because of substrates dilution. Lower nitrogen concentrations and shorter operation periodic time would also benefit for the bacteria culture while at the same nitrogen load. The sludge selected from aerobic sludge treating municipal wastewater with endogenous-denitrification method could steadily react as anammox with the nitrogen load of $0.156 \,\text{kgN} / \text{m}^{3} \cdot d$. In this study the highest influent nitrogen concentrations were $500 \,\text{mg} \,\text{NH}_{4}^{+}\text{-N} \,/\, \text{l}$ and $580 \,\text{mg} \,\text{NO}_{2}^{-}\text{-N} \,/\, \text{l}$, the removed $\text{NH}_{4}^{+}\text{-N} \,/\, \text{NO}_{2}^{-}\text{-N}$ ratio was $1:1.12$, closely to the reported value, and sludge became red, which all indicated that endogenous-denitrification sludge could be adopted to anammox bacteria enrichment, and endogenous-denitrification method could be adopted to treating sludge digestive liquid. The research showed that SBR for anammox sludge enrichment was most stable to flow rate shock, but it was very sensitive to substrate shock because of nitrite inhibition.