Using fast store oscilloscope(100MHz, fast writing speed 1!0DIV／μs),the time-of-flight profiles of electrical signals induced by laser ablated Al target has been measured.The Q-switch YAG laser runs at its foundational frequency 1.06μm with 10ns pulse width and 108pulse, the ablation point diameter is 200μm, so the laser irradiation flux is about 10×1011W／cm2Abundant electrical signals are observed on target and probe simultaneously.A fast rising transient electron peak that has almost the same duration of the laser is observed,its average speed is more than 107cm／s.Meanwhile,the ion kinetic energy is about several hundred electron volts.Besides this, the experiments have shown that vacuity has strong influence to the time-of-flight profile.Considering the results obtained from spectra experiments,an appropriate explanation is given.%利用快速存贮示波器(100MHz)对脉冲激光烧蚀固体Al靶产生的等离子体信号的飞行时间特征进行了测量．在YAG脉冲激光基频输出(脉宽10ns,波长1.06μm,能量108mJ／pulse)、烧蚀斑的直径为200μm、靶面上激光功率密度约为1×1011W／cm2的条件下，分别在靶和靶前方的探极测到带电粒子信号．通过这些信号的飞行时间轮廓，观测到持续时间与激光脉宽相当的峰值极大的快速光电子和持续时间达μs的等离子体中的热电子，并估算出快速光电子的平均速度在107*!cm／s以上．同时测得离子动能达几百eV．实验还表明，真空度对信号轮廓有很大影响，结合光谱实验的结果，给予了适当的解释．
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