When the truck crane using rolling device for loading and unloading, should ensure that the thickness of the rolling bar is consistent, so that the use of the more smooth, the width than the object to be 50 centimeters wide, prohibit wearing gloves to fill the rolling bar, in order to prevent slipping. In the use of lifting large equipment tower, should cooperate with more than one winch joint operation, to winch winding speed to maintain consistency, to ensure that the tower on the force points in balance, to avoid uneven force and lead to lifting equipment tower deformation. In the use of slewing method or toggle method for lifting, the tower bottom to maintain stability, need to install fixed to assist, to offset the lifting process generated by the horizontal thrust.