Hi Yan,
Bluetooth Bee and Xbee is compatible in TX,RX,RESET and GND pins.
The following info is from http://www.arduino.cc/en/Main/ArduinoXbeeShield
With the jumpers in the Xbee position (i.e. on the two pins towards the interior of the board), the DOUT pin of the Xbee module is connected to the RX pin of the microcontroller; and DIN is connected to TX. Note that the RX and TX pins of the microcontroller are still connected to the TX and RX pins (respectively) of the FTDI chip - data sent from the microcontroller will be transmitted to the computer via USB as well as being sent wirelessly by the Xbee module. The microcontroller, however, will only be able to receive data from the Xbee module, not over USB from the computer.
May this helpful to you,
-Icing