A new approach to obtain millisecond-level long-pulse solid-state laser, pumped by some common pulsed high-power laser diode(LD) arrays with the pump pulse width of several hundreds microseconds, has been carried out. The long-pulse laser runs with high repetition rate and long life time. The pump laser diode arrays are six dual-line bars with a total peak power of 1.2 kW and duty cycle of 5%, which are divided into two groups. Based on time division pumping technology, NdYAG laser rod is pumped by the two groups successively. An average output power of 11.2 W and laser pulse width of about 1 ms have been obtained under pump electric current of 85 A.