On-line　monitoring　and　diagnosis　of　wind　power　generation　is　not　easy　because　of　its　discrete　distribution.　In　this　paper,　a　new　monitoring　and　diagnosis　system　for　this　problem　is　presented,　which　is　based　on　ad-hoc　networks.　The　reliability　and　maintenance　is　improved　dramatically　and　some　special　functions　for　components　failure　alert　are　also　added.　Finally,　a　small　ad-hoc　network　for　simulation　of　wind　power　generation　monitoring　and　diagnosis　is　fabricated　in　the　laboratory,　and　a　special　routing　algorithm　is　designed.　The　experiments　show　that　the　monitoring　and　diagnosis　of　wind　power　generation　based　on　ad-hoc　networks　is　practical　and　can　be　used　in　reality.　©　2010　IEEE.