A simple system of measuring solid-state laser instantaneous facula intensity space-time distribution was established, based on the principle of CCD diffused transmission imaging. Experiments of verifying the feasibility of this system were carried out, and the pulse laser spot images were obtained with precision, and the laser intensity space-time distribution parameters such as beam radius, facula dithering, beam quality, light distributions and average power were obtained through CCD measuring data which were processed by Matlab soft ware. At last, the experiment result show that the method of CCD diffused transmission imaging for measuring laser instantaneous distribution is feasible, and the system acquisition frequency could reach 120 Hz. This system had advantage of high resolution, high frame frequency, low-cost and easy to use, which could realize the synchronous measurement between large laser spot intensity distribution and power, with less than 2 percent power measured error.