User　interface　prototyping　is　an　efficient　approach　for　eliciting　user　requirements　in　the　early　phase　of　software　development.　It　is　an　iterative　analysis　technique　in　which　users　are　actively　involved　in　the　mocking-up　of　the　UI　for　a　system.　It　is　typically　done　in　a　drag-And-drop　fashion　by　professionals,　which　is　time-consuming　and　requires　specialized　knowledge.　This　paper　presents　a　prototype　tool　SAIP　(Semi-Automatic　user　Interface　Prototyping),　which　allows　users　to　express　their　natural　language　requirements　and　semi-Automatically　generates　a　corresponding　graphical　user　interface.　Based　on　a　systematic　literature　review　of　the　user　interface　prototype,　we　design　a　framework　that　maps　natural　language　to　the　user　interface　prototype.　Furthermore,　develop　a　demo　version　of　the　SAIP-a　user　interface　prototyping　tool　served　from　natural　language　processing　and　neural　network　for　the　user　interface　automatic　generation.　Our　tool　aims　to　help　users　who　have　little　knowledge　in　user　interface　design　to　express　their　ideas　and　requirements　freely.　©　2021　CEUR-WS.　All　rights　reserved.