Polyacrylamide　(PAM)　serves　as　an　effective　thickening　agent　for　oil　recovery.　However,　its　viscosity　loss　during　underground　transport　significantly　reduces　oil　recovery　efficiency　in　reservoir　applications.　To　solve　this　problem,　polyurethane　was　selected　for　microencapsulation　of　PAM　through　a　simple　emulsion　polymerization　method　in　this　work.　It　is　worth　mentioning　that　non-toxic　and　renewable　D-sorbitol　was　used　as　a　chain　extender　in　the　synthesis　of　polyurethane　microcapsules　instead　of　the　commonly　used　diols　or　diamines　obtained　from　non-renewable　petroleum　resources,　which　has　not　been　reported　in　previous　reports.　Mechanical　stirring　was　used　to　simulate　the　state　of　polymer　subjected　to　shear　during　stratigraphic　transport.　The　releasing　performance　of　the　microcapsules　was　characterized　by　measuring　the　change　of　viscosity　with　time.　Meanwhile,　we　optimized　the　ratio　of　D-sorbitol　to　achieve　the　longest　release　time.　Experiments　showed　that　D-sorbitol　was　feasible　as　a　chain　extender　for　the　preparation　of　microcapsules　of　polyurethane,　and　the　microcapsules　prepared　at　a　concentration　of　8%　D-sorbitol　solution　had　the　longest　slow-release　time　of　75　h　at　25　degrees　C　and　500　rpm.　We　also　prepared　samples　with　BDO　as　a　chain　extender　for　comparison,　and　the　experiments　showed　that　SO8　has　a　longer　slow-release　time　and　can　better　meet　the　demand.　The　prepared　microcapsules　SO8　exhibited　excellent　shear　resistance　and　heat　resistance,　which　was　attributed　to　the　rigidity　and　high　cross-linking　density　brought　about　by　D-sorbitol　as　a　hard　chain　segment　of　polyurethane.　These　PAM-containing　microcapsules　had　a　promising　application　in　enhancing　oil　recovery.