According to sub-nanosecond laser pulses, an electronic fast-pulse sampling method is put forward based on picosecond pulse transmission line and high speed electronic circuits. The design of strobe pulse generation and high speed sample-holding circuit are given as well as an interleaved sampling method for increasing the real-time sample rate, which is a plurality of sampling gates array configured in parallel. This electronic sampling can be used in the exact parameter measurement of multi-beam laser pulses.