The mineralogical, petrological and geochemical studies on Keliyang potassic dykes have been carried out to understand their rock types, the petrogenesis and the nature of their mantle sources. They are potassic lamprophyre, not lamproites as the previous researchers believed. In this study, the whole-rock major and trace element compositions of another 6 lamproite dykes recently discovered are reported. Major elements were determined by X-ray fluorescence spectrometry (XRF) techniques, while REE and trace elements were determined by inductively coupled plasma mass spectrometry (ICP-MS). They can be classified into phlogopite-diopside lamprophyre, leucite-diopside lamprophyre and granular carbonatite- bearing diopside lamprophyre on the basis of their mineral components. They are all characterized by relatively low SiO_2 (41.31%-44.84%), TiO_2 (0.75%-0.86%) and high MgO (7.30%-11.33%), K_2O (4.01%-6.01%) concentrations with K_2O/Na_2O ratios of 2.77-12.49. In addition, they display enrichment in large-ion lithophile elements (LILEs, e.g., Rb, Sr, Ba) and LREE, but a relative depletion in high-field-strength elements (HFSEs, e.g., Nb, Ta, Zr, Hf and Ti). They display similar chondrite-normalized REE patterns with slight negative Eu anomalies (δEu=0.64-0.82), and high initial ~ 87 Sr/~ 86 Sr ratios, which resemble those of high K/Ti and low-Ti potassic magmas formed in subduction-related settings. Consequently, we suggest that the parental mag-ma was generated by partial melting of the phlogopite-amphibole-bearing garnet lherzolite within the lithospheric mantle that might have been metasomatized by a potassium-bearing fluid released from a subduction oceanic crust. The mineralogical, petrological and geochemical studies on Keliyang potassic dykes have been carried out to understand their rock types, the petrogenesis and the nature of their mantle sources. They are potassic lamprophyre, not lamproites as the previous researcher believed. -rock major and trace element compositions of another 6 lamproite dykes recently discovered are reported. Major elements were determined by X-ray fluorescence spectrometry (XRF) techniques, while REE and trace elements were determined by inductively coupled plasma mass spectrometry (ICP-MS) They can be classified into phlogopite-diopside lamprophyre, leucite-diopside lamprophyre and granular carbonatite-bearing diopside lamprophyre on the basis of their mineral components. They are all characterized by relatively low SiO 2 (41.31% -44.84%), TiO 2 -0.86%) and high MgO (7.30% -11.33%), K 2 O (4.01% -6.01%) concentrations with K 2 O / Na 2 O ratios of 2.77-12.49. In addition, they display enr ichment in large-ion lithophile elements (LILEs, eg, Rb, Sr, Ba) and LREE, but a relative depletion in high-field-strength elements (HFSEs, eg, Nb, Ta, Zr, Hf and Ti) similar chondrite-normalized REE patterns with slight negative Eu anomalies (δEu = 0.64-0.82), and high initial ~ 87 Sr / ~ 86 Sr ratios, which resemble those of high K / Ti and low-Ti potassic magmas formed in subduction-related settings. If we suggest that the parental mag-ma was generated by partial melting of the phlogopite-amphibole-bearing garnet lherzolite within the lithospheric mantle that might have been metasomatized by a potassium-bearing fluid released from a subduction oceanic crust.