In　this　paper,　the　sampled-data　leader-following　consensus　problem　is　considered　for　a　group　of　double-integrator　multi-agent　systems.　It　is　assumed　in　this　problem　that　measurement　output　is　only　available　at　sampling　instants,　and　the　value　of　the　control　input　only　updates　at　those　sampling　instants.　To　solve　this　problem,　a　sampled-data　output　feedback　control　based　on　distributed　continuous-discrete　observer　is　proposed.　This　new　algorithm　has　the　performance　that　the　sampling　period　can　be　freely　chosen.　We　then　show　the　asymptotic　stability　of　the　equivalent　discrete-time　system　transformed　from　sampled-data　closed-loop　system.　A　simulation　example　is　provided　to　illustrate　the　validity　of　the　theoretical　result.　©　2020　Technical　Committee　on　Control　Theory,　Chinese　Association　of　Automation.