In recent years,laser diode pumped alkali laser (DPAL) has obtained a rapid development which has great potential to become a new kind of high-energy laser.But the absorption linewidth of the alkali atom even with proper one atomspheric pressure of buffer gas is difficult to exceed 100 GHz comparing with the 1000 GHz linewidth of the commercial diode laser.In order to pump the alkali laser efficiently,the high power frequency narrowed diode laser is needed.On the basis of the principle of laser diode pumped alkali laser,different ways to narrow the linewidth of high power diode lasers are introduced,the characteristics of each method are compared and a review on expectation and development for high power frequency narrowed diode laser is made.