The utility model relates to a GIS installs technical field, concretely relates to dustproof protection against rodents window in GIS installation room, including the window frame, the dust screen can be dismantled in the installation in the window frame, can dismantle the dust screen and be equipped with the double -layer steel silk screen, presss from both sides between the double -layer steel silk screen and establishes filtering cotton layer, and the outdoor one side of window frame orientation sets up the ventilated membrane. The utility model discloses it is indoor to prevent that outdoor dust impurity from passing through the installation of window entering GIS, provide safeguard for GIS equipment reliability service, the filtering cotton layer that can dismantle the dust screen can prevent that outdoor dust debris from passing through the window and getting into indoorly, the double -layer steel silk screen can prevent the mouse, the invasion of toys such as snake, but the dust in the outdoor air of ventilated membrane effective absorption that sets up, can effectively reduce room air dust concentration, can pull down the washing with dismantling the dust screen after using a period, removable filtering cotton layer in case of necessity.