In　this　paper,　the　dynamical　behaviors　of　a　new　Wien-Bridge　oscillator　circuit　is　investigated.　A　sufficient　and　necessary　stability　condition　for　the　circuit　is　deduced,　and　a　necessary　condition　to　generate　chaos　is　also　obtained.　The　simulation　and　hardware　experiment　both　verify　the　correctness　of　the　above　two　conditions.　The　spectrum　characteristic　indicates　that　this　Wien-Bridge　oscillator　can　work　under　a　large　range　of　frequencies　from　Hz　to　MHz.