The doorframe of the testing gate is made of aluminum alloy, inner side is aluminium sheet, outside is made of trapezoid corrugated aluminum sheet, filled with middle glass fiber felt as heat preservation. Testing gate and doorframe connect by hinge, in the middle of the door equipped with sliding-door lock, it can automatically lock when closing the door. To ensure the safety of the test, equipped with safety push rod behind the sliding-door lock, which is ended at outdoor. In the test the door closed, testing personnel in the interior, only push the safety rod, the testing gate can be automatically opened, to ensure the safety of the test.