Beside fractional crystallization model, liquid immiscibility of Fluorinerich granite magma is an important mechanism to form pegmatite and pegmatite type deposit. Researches of melt inclusions and experiment showed that Fluorinerich granite magma tends to liquid immiscibility, and forms a pair of conjugated magma of volatilerich, Sipoor magma and volatilepoor, Sirich magma. Sohlieren type pamatites and injected pegmatite veins, differentiation of some elements such as volatiles and isotopes in different phases are important symbols of the liquid immiscibility. The immscibility of Fluorinerich granite magma can explain the minerals zoning in pegmatites, and challenge the traditional pegmatiteforming theories. Furthermore, the immiscibility can enrich rare elements to high level, which owe to the affinity of volatile like F, B, P, etc to rare elements. But, at present, the studies on oreforming of the immscibility of Fluorinerich granite magma are poor, due to lacking of ideal studying objects. The Jiajika deposit, western Sichuan, China, is the largest solid lithium deposit in Asian. Preliminary studies showed that liquid immiscibility of Fluorinerich granite magma happened in the Jiajika deposit, and the Jiajika deposit is an ideal object to study the orders of distribution, transference and enrichment of rare elements.