A new instrument and a method concerning measurement of pulsed laser multi-parameters are proposed by one sample, based on a bunch of single-mode fibers which are designed serial number with different lengths. Its advantages are high damage threshold and real temporal-spatial domain sample, and a large of attenuation without aberration. By an O-E probe with a big sense area, the laser signal from the bunch of fibers transforms a list of electrical waveforms that could be real-time displayed on digital storage oscilloscope, which would measure real-time for laser parameters of single pulse. Meanwhile, several designs are presented.