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Inrush Current Limiter for spacial switching convertor is recommended in this paper. There is a P-Channel MOSFET in series with positive power line, Voltage between Gate and Source(VGS) is controlled by RC Net. Inrush Current can be limitted by changing Raise rate of VGS (dv/dt), which depends on parameter of RC Net. The experimental results show that the circuit is capable of inhibiting the starting current to 1.5 times that of the rated current, or no more than 2 A; at the same time, the duration of the starting current is not more than 5 ms and the rising slope is less than 10⁶A/s.The Limiter is widely used for space electronic devices,which run steadily and reliably. Besides, the theory and measurement of Inrush Current are introduced. 