Abstract: Shandong Artificially Triggering Lightning Experiment (SHATLE) has been conducted continuously since the summer of 2005. During the six years from 2005 to 2010, twenty-two negative lightning flashes containing eighty-eight return strokes were successfully triggered. Channel base currents, close electromagnetic fields, and high-speed camera images were obtained simultaneously for some of the strokes. Based on directly measured currents for thirty-six return strokes, the geometric mean of return stroke peak current was about 12.1 kA with a maximum of 41.6 kA and a minimum of 4.4 kA, the half peak width of current varied from 1 to 68 μs, and the geometric mean values of 10%－90% risetime, charge transfer, and action integral were about 1.9 μs, 0.86 C, and 2.6×103A2?s, respectively. The surface electric field at 30 m away from the discharge channel caused by a return stroke with peak current of 16.5 kA reached 111.9 kV/m. The geometric mean of magnetic field at 60 m away from the discharge channel was about 52 μT. The peak current and charge transfer of some large M components were comparable with those of return stroke. The speed of upward positive leaders in the initial stage of triggered flashes was about 0.96×10.5 m/s.