The receiving system of laser scanner requires the signal with narrow pulse, high repetition rate and wide bandwidth. To meet these requirements, two peak-holding circuits whose holding time is adjustable are proposed. For one method, transconductance amplifier circuit is adopted to realize the peak-holding, and mono-stable multivibrator is applied for holding time control. For the other method, by combining FastFET calculation amplifier with AND gate delay, the peak-holding circuit with controllable holding time is implemented. After simulation and analysis, transconductance amplifier circuit is selected. Experiments show that the selected circuit can hold the peak of the signal with 15 ns pulse width, 200 kHz repetition rate and 50 MHz bandwidth, and the holding time is adjustable.