The Amphibious crawler robot chassis combines functions of cars and boats perfectly. It is a kind of special vehicle that can travel on land like tanks and float across waters like boats steadily. Due to its outstanding amphibious performances, the robot chassis can turn to travel across or on water(such as rivers, lakes and sea), free of limitation of bridges or boats.  The buoyancy of the vehicle can be guaranteed by its necessary displacement caused by its enclosed body. It can be directly paddled by crawler belts, or driven by specialized water propellers (such as propellers or jet propellers). The vehicle can tarvel on land via crawler belts at 5KPH. The models (directly paddled by crawler belts) are simple in structure, but it has interior speed and maneuverability across or on water. While models, which have specialized water propellers (such as propellers or jet propellers), are excellent in waterborne performance.