Odor　emissions　from　intensive　livestock　farms　have　attracted　increased　attention　due　to　their　adverse　impacts　on　the　environment　and　human　health.　Nevertheless,　a　systematic　summary　regarding　the　characteristics,　sampling　detection,　and　control　technology　for　odor　emissions　from　livestock　farms　is　currently　lacking.　This　paper　compares　the　development　of　odor　standards　in　different　countries　and　summarizes　the　odor　emission　characteristics　of　livestock　farms.　Ammonia,　the　most　common　odor　substance,　can　reach　as　high　as　4100　ppm　in　the　compost　area.　Sampling　methods　for　point　and　area　source　odor　emissions　are　introduced　in　this　paper,　and　odor　analysis　methods　are　compared.　Olfactometers,　odorometers,　and　the　triangle　odor　bag　method　are　usually　used　to　measure　odor　concentration.　Odor　control　technologies　are　divided　into　three　categories:　physical　(activated　carbon　adsorption,　masking,　and　dilution　diffusion),　chemical　(plant　extract　spraying,　wet　scrubbing,　combustion,　non　thermal　plasma,　and　photocatalytic　oxidation),　and　biological　(biofiltration,　biotrickling,　and　bioscrubbing).　Each　technology　is　elucidated,　and　the　performance　in　the　removal　of　different　pollutants　is　summarized.　The　applica-tion　scopes,　costs,　operational　stability,　and　secondary　pollution　of　the　technologies　are　compared.　The　genera-tion　of　secondary　pollution　and　long-term　operation　stability　are　issues　that　should　be　considered　in　future　technological　development.　Lastly,　a　case　analysis　for　engineering　application　is　conducted.　(c)　2021　Elsevier　B.V.　All　rights　reserved.