We describe about characteristics of creeping discharge developed in a partial narrow space with a backside electrode，under μs pulse voltage application. As a result，in the case of a filamentous straight backside electrode at 0.3MPa; flashover voltage decreased from about 16.4 kV to 15.0kV by 3% SF₆ mixture in N₂.V- characteristics of which flashover voltage decreased were obtained by SF₆ mixture in N_2. We obtained V-characteristics on the flashover voltage of SF₆ content at D =0% -10% for a filamentous backside electrode (φ; filamentous backside electrode diameter，about φ=0.9mm). The behavior of V-characteristics of flashover voltage depened on a partial narrow space. In the corona extension obtained using ultra-high speed camera，the flashover along the backside electrode was observed.

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