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Recently Terahertz radiation from laser-produced plasmas has attracted much interest since plasmas can work at arbitrarily high laser intensity.However,only few experiments with relativistic laser pulses are reported.The THz generation is either not understood well.We have systematically studied strong THz radiation from solid targets driven by relativistic laser pulses.The experiments are carried out using femtosecond and picosecond laser systems,respectively.THz radiation with a pulse energy of tens μJ/sr(driven by femtosecond pulses),even hundreds μJ/sr(driven by picosecond pulses)is observed.