A novel nanoseconds ultrawideband (UWB) balanced pulse generator is designed and demonstrated in this paper. It contains a pulse drive circuit, an avalanche transistor pulse circuit and a pulse forming circuit. The pulse drive circuit produces a sharper trigger pulse and the avalanche transistor pulse circuit uses a novel transistor cascade construction to produce a high amplitude gauss pulse. At last, the pulse forming circuit utilizes parallel butt joint resistor network and schottky diode to eliminate the signal reflection and uses balun to produce a balanced gauss pulse. It can operate well at the pulse repetition frequency(PRF) up to 300 kHz. Measurement results are presented, which show the output of the generator are balanced pulses with peak values of 230 V at 100 kHz PRF and 1.3 ns in pulse leading edge with very small ringing and overshoot. These characters of the balanced gauss pulses are advantageous for obtaining deeper detection range and costing less data computation time when it is applied to ground penetrating radar applications.