There is an increasingly higher requirement on the pulse source of kicker in the injection and extraction system with the development of accelerators. As a special nanosecond switch, Drift Step Recovery Diode (DSRD) has a great application prospect in pulse power technology for its notably short switching-off time and large working current. However, there are some factors such as pre-pulse that make the pulse waveform deviate from the ideal shape. A prototype of pulse generator was designed and tested. It is based on a basic DSRD circuit, at the same time, the Non-Linear Transmission Line (NTL) is used to shape the pulse, compress the edge and reduce the residual voltage. Its circuit experiment shows that the pulse amplitude on resistor load of 50 Ω is about 10 kV, the rise time and fall time are about 2 ns (10%-90%) and the bottom width (3%-3%) is less than 8 ns.