In　this　paper,　we　introduce　the　notion　of　partial　affine　system　that　is　a　subset　of　an　affine　system.　It　has　potential　applications　in　signal　analysis.　A　general　affine　system　has　been　extensively　studied;　however,　the　partial　one　has　not.　The　main　focus　of　this　paper　is　on　partial　affine　system-based　frames　and　dual　frames.　We　obtain　a　necessary　condition　and　a　sufficient　condition　for　a　partial　affine　system　to　be　a　frame　and　present　a　characterization　of　partial　affine　system-based　dual　frames.　Some　examples　are　also　provided.