Starting　from　the　free　Polyakov　action　of　an　open　2-brane,　we　obtain　the　solutions　to　the　Euler-Lagrange　equation.　By　relating　the　normal　modes　to　the　raising　and　lowering　operators　and　defining　the　vacuum　state,　we　achieve　the　spectrum　of　the　open　2-brane　at　different　levels.　Interestingly,　there　are　two　kinds　of　tachyon　states　appearing　as　scalar　states　and　vector　states,　respectively.　Besides,　the　graviton　fields,　Kalb-Ramond　fields,　dilaton,　and　photon　states　appear　at　the　same　level　in　the　open　2-brane　model.