Quite a few lamprophyre dikes are developed in the Daping gold ore district, mostly associated with quartz veins. Petrochemically, SiO2 content, MgO content and K2O/Na2O ratios are 44.86%～54.10%, 5.84%～13.52% and 0.56～2.09, respectively, suggesting a shoshonite series; rocks of the lamprophyre dikes are enriched with large-ion lithosphile elements (Sr, U, Rb, Ba) and LREE and depleted in high-field-strength elements (Ta, Nb, Ti), assume “TNT" negative anomalies of Ta, Nb and Ti, and have δEu values of 0.72～1.36, with indistinct negative Eu anomalies; 87Sr/86Sr ratios are in the range of 0.7066～0.7074 (0.7071 on average)，higher than the modern value of original mantle (0.7045)；143Nd/144Nd ratios are 0.5124～0.5125 (averagely 0.5124)，lower than the modern value of original mantle (0.512638)；εNd values range from -2.5 to -4.6 (averaging -3.98). Nb/Ta ratios vary in the range of 48.96～82.58 (averaging 62.99 )， much higher than the value of original mantle (17.5±2.0)； Zr/Hf ratios are in the range of 20.45～47.53 (averaging 39.57)， slightly higher than the value of original mantle (36.27±2.0)； Nb/Ta and Zr/Hf ratios are much higher than the values of the continental crust (11 and 33), respectively. It is thus thought that the source rock of the lamprophyre is an early subducting oceanic crust or an enriched mantle which might have been metasomatized by the enriched fluids released from the dehydration of the root matter in the orogenic belt. The magma was formed in a post-collision intraplate environment and was mixed with small amounts of crustal matter as it intruded upward. Whether in time, space or mechanism, the lamprophyre dikes in the Daping ore district must have had a close genetic relationship with big tectonic events in the Jingshajiang-Ailaoshan tectonic belt.