The characteristics and hazards of odor produced during the dewatering process of municipal sludge were introduced. The factors influencing the formation of odor pollutants were discussed. Thecurrent source control and end treatment control technologies were summarized. Then the developmenttrend of the technology was prospected. The analysis shows that the composition of the odor is related tothe sludge properties and dewatering technologies and is affected by the sludge composition, sludge res⁃idence time, temperature and turbulence degree. The odor has complicate composition and low olfactorythreshold, thus the advanced technologies of source control and end treatment control should be com⁃bined to treat odor. The future technology development will focus on biological method, chemical wash⁃ing, advanced oxidation and resource recycling.