Abstract: A planar cryotarget system for the inertial-confinement-fusion(ICF) experiments was set up with the low-temperature resource provided by a Gifford-McMahon cryocooler. The cooling power and the cooling rate of the planar cryotarget system were examined as functions of temperature. This system can reach a lowest temperature of 10 K, and its cooling powers are 3 W at 14 K and 6.5 W at 18.6 K. The cooling rate can be artificially adjusted. Using this system, the argon and hydrogen vapors at 300 K are condensed to liquid or solid in a cylindrical target cell. With the help of Mach-Zehnder interference, the planar cryotarget system is also applied to reveal that the ICF capsules are structurally deformed with decreasing the temperatures．