Abstract: There are 2 sequences of source rocks including the Cambrian-Middle-Lower Ordovician and the Carboniferous in the Bachu-Maigaiti area of the Tarim Basin.The source rock evolution history in the Bachu Uplift is different from which in the Maigaiti Slope.The hydrocarbon migration systems include reservoir fracture,fault and unformity.The hydrocarbon accumulation in the area can be divided into 3 periods such as the late Caledonian-early Hercynian,the late Hercynian and the Himalayan.Reservoirs were destructed in the late caledonian-early Hercynian,destructed or persered in the late Hercynian and generated or adjusted again in the Himalayan.Acorrding to major hydrocarbon accumulation as well as source rocks and reservoirs,there are 4 types of hydrocarbon accumulation models in the area: a)the early hydrocarbon accumulation;b)the secondary early hydrocarbon accumulation;c)the early hydrocarbon accumulation-destruction-late accumulation again;d)the late hydrocarbon accumulation.