The kimberlite rock region from South Liaoning is the largest primary diamond producing area in China. Porphyritic kimberlites, which are the main host rock of diamond, are typically dominated by olivine. We have divided olivine in kimberlite into three generations according to structural characteristics: coarse- grained olivine, olivine phenocrysts, fine- grained olivine crystals in matrix. Here we build an integrated model to show the origin, ascent, eruption, and diagenesis of porphyritic kimberlite magma from South Liaoning and its petrographic characteristics. Synthesising our data with previous studies, we discuss the formation process of minerals in each generation. These include partial melting of the mantle peridotite with phlogopite that formed the initial carbonatic magma. During ascension, the orthopyroxene in the lithospheric mantle peridotite was continuously dissolved forming coarse- grained olivine. When the magma components could no longer change, a stable kimberlite magma was formed. The magma continued to ascend to the surface rapidly and erupted. Finally, the magma gradually cooled and consolidated into the porphyritic kimberlites that included coarse- grained and two other generations of olivine.