We analyze the high velocity cloud HVC 53.9+1.3 using the highly sensitive and high angular resolution H i data piggybackly recorded by the FAST Galactic Plane Pulsar Snapshot survey. Detailed sub-structures of the HVC are resolved, the densest peak of the HVC has an H i column density of NHI = 2.87 × 1019 cm−2, two orders lower than the main component of the Galactic H i disk. Using the Gaussian decomposition method, cold and warm phases of H i gas clouds are separated. Cold H i gas is found in a supersonic state with Mach number of , and tends to associate with high H i density, with cold cores surrounded by skins of warmer gas, while warm H i gas is in a subsonic state with .

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