Abstract: “The potassic and sodic mantle alkali-rich magma systems” are the integral of all igneous rocks that are formed in a short geological period，and include the ultrabasic，basic，intermediate and acidic alkali-rich rocks along deep faults．The integral of potassic rocks is named potassic mantle alkali-rich magma system ，and the integral of sodic rocks is named sodic mantle alkali-rich magma system．The study for Ailaoshan—Jing shajiang potassic alkali, rich igneous rocks belt show that in intrusion depth，these rocks can be hypogene，hypabyssal and extrusive；in lithology，they can be ultrabasic，basic，intermediate and acidic；and in alkalinity most rocks are alkaline and weakly alkaline．Their striking features are K>Na，high potassium and alkali-rich．In petrochemistry，these rocks are generally highly alkaline(Na20+K2O range from 4.55% to 12.5%)，potassium -rich(K20/Na20 ratio is 1.15—3.20)，with high CaO (2.20% ～14.9%)，high Rb，Sr，Ba，Th，U ，and low Rb/Sr．The total contents of rare earth elements are higher．the light rare earth elements are strongly enriched．and the 8Eu values are low ．Most Isr values range from 0.705 to 0.706．INd range from 0.512305 to 0.512630．The Sr-Nd-Pb isotopic data imply that the magma of this rock belt was derived from EM II type mantle source．and probably directly came from a kind of potassic mantle．The Anning river sodic alkali, rich igneous rock belt are also hypogene，hypabyssal and extrusive in intrusion depth，ultrabasic，basic，intermediate and acidic in lithology and mostly are alkaline and weakly alkaline in alkalinity．Most of sodic alkali-rich rocks are high in Na20+K20 (5.67%～14.44%)，sodium-rich(the K2O/Na20 ratio is 0.22～0.90)，with high contents of Ti02(0.15%～6.44%)and large ion lithophile elements．Nb，Ta，Zr and Rb/Sr are relatively higher．The contents of light rare earth elements are lower than those of potassic rock belt，but u values are higher，and sometimes even positively abnorrea1．J values range from 0．705 to 0．706．INd value is about 0.512630．These rocks are similar to the igneous rocks in the rift area derived from mantle．They are mainly derived from mantle multi-period sodic alkali-rich magma and multi-stage evolved．The study shows that there are not only potassium -rich mantle source areas，but also sodium -rich mantle source areas．These mantle magmas were form ed in the deep mantle under the high pressure an d high temperature conditions．As the passageway of magma uprising，the ultra-deep faults are important for formation of the potassic and sodic mantle alkali-rich magma systems．