Abstract: The UV optical probe at xingguang-Ⅱ laser installations is pumped by a sub-laser beam.A pulse of 800ps with 1054nm wavelength is converted into an output UV pulse with 1mJ energy,60ps pulse-width and 308nm wavelength through stimulated Raman frequency conversion.The obtained UV laser pulse can be used as the lamp-house for laser plasma diagnosis.The original optical probe can't run steady because of poor quality and structure instability.In order to enhance the quality and stability,engineering alteration is performed on the original system.Experiment results prove that the optical probe can output an uniform pulse with 1mJ energy 30ps pulse-width,and it can operate steadily with stabilization rate over 90%,which meets the requirement of the probe lamp-house for laser plasma diagnosis.