Graphic　User　Interfaces(GUI)　is　an　important　component　of　modern　software,　and　incorrect　implementation　of　GUI　will　reduce　the　usability　and　reliability　of　the　overall　software　application.　Testing　is　an　effective　way　to　discover　defects　and　increase　the　quality　of　GUI.　Generation　of　test　cases　is　an　important　phase　of　GUI　testing,　and　it　can　be　achieved　in　manual　or　automatic　approach.　Due　to　the　high　complexity　of　GUI,　it　is　impractical　to　generate　test　cases　manually.　So,　it　is　a　reasonable　way　to　generate　test　cases　from　a　GUI　model　automatically.　What　is　the　GUI　model　and　how　to　create　the　model　are　still　difficult　tasks.　In　this　paper,　we　redefine　the　event,　propose　an　event　handler　graph(EHG)　model　which　is　considered　as　a　GUI　model,　and　put　forward　a　grey-box　approach　which　combines　the　dynamic　method　and　static　analysis　of　source　code　to　create　a　GUI　model　automatically.　The　GUI　model　can　be　used　as　a　basis　for　generating　test　cases　automatically　subsequently.