A Space port key update method and system for

The present invention discloses a method and system for updating an air interface key, updating method comprising: a serving radio network controller after the migration decision, the serving radio network controller transmits the key information directly to the destination radio or via a core network node a network controller; or the serving radio network controller notifies core network node, transmitting the key information from the core network node to the target radio network controller. And updating method updating system according to the present invention can improve system security.