A tunable pulse width all solid state self-locking mode burst pulse laser is designed to address the problems of lowburst pulse power and complex device in current pulse lasers. The burst pulse generation mechanism of an intracavity Fabry-Perot（F-P） structure self-locking mode laser is theoretically analyzed, and a theoretical model of the self-locking mode burst pulselaser is established. The experimental results show that the pulse width of the burst pulse becomes wider as the length of the lasercrystal increases. When the length of the laser crystal is 5 mm and the pump power is 5.5 W, a burst pulse with a beam qualityfactor of 1.42 is obtained. The repetition frequency of the burst pulse is 13.64 GHz, the maximum average output power is 0.78 W,and the corresponding slope efficiency and optical-to-optical conversion efficiency are 9.57% and 8.73%, respectively.