To improve the imaging quality, a pulse tube cryocooler is used in the remote sensor, and it is installed in the Dewar assembly to make the infrared focal plane work in very low temperature. The thermal resistance between the cold head and the heat head should be big enough to improve the refrigeration efficiency of the pulse tube cryocooler. The thin-walled pulse tube connects the cold head and the heat head, and its radial support stiffness is too low to bear the vibration of satellite during launching. The traditional scheme is to add metal pole support structure, but the structure will bring additional heat leakage and the thermal deformation caused by the temperature difference of metal pole structure will cause the detector deformation, which will affect the imaging quality. A glass fiber support structure was proposed. The glass fiber had the advantages of high tensile modulus, low thermal conductivity and very small area, and with reasonable position design this structure will improve the radial support stiffness and reduce the heat leakage. Because of the characters of low bending stiffness, the thermal deformation cannot pass to the detector. Compared with the metal pole support structure, the thermal resistance of glass fiber support structure increases by 3 730 times, and solves the problems of high vibration resistance and low heat leakage.