Abstract: The slip-type hanger for liner cementing could not meet the operation requirments of long liner hanger cementing in deep well.To run the 1 800m long,77.8m(7in) liner in a 4 700m gas prospect,a new WXG9×7 external ledge hanger was developed by Changqing Oilfield.The structure features and bench test in lab were described,as well as the simulation test and field application.The advantage had been shown in field practice,such as reliability and simplicity in operation,large circulating annular,good sealing property and capablity of moving the liner,etc.It was registered for patent with the No.L95212929.9.