A large-dynamic-range X-ray picosecond streak camera system is devel oped for diagnosis of laser inertial confinement fusion.The 130fs and 8ps UV lasers are used to build X-r ay streak camera dynamic test systems,and the performance of the streak camera is tested.W ith two sets of calibration conditions,the experimental results show that the limiting temporal resolution of the X-ray s treak camera is 5.0ps and the dynamic range is 513.7∶1and 2237.1∶1respectively.The diff erence in experimental results is due to the space charge effect of photoelectrons,including time disp ersion and spatial broadening in the technical temporal resolution.In the femtosecond and picosecond laser excitatio n conditions,the femtosecond electron pulse emission current density is 61.5times of that of picosecond case the streak camera time dispersion and spatial broadening caused by space charge effe ct of femtosecond electron pulse are larger,and the extent limited streak camera performance is more serious.T he results of this study are important to analyze the temporal and spatial information mechanisms of X-ray s treak camera,and have guiding significance for optimizing the design of streak camera systems and laser experi ment and calibration of streak cameras.