The interpretation of sedimentary facies remains controversial since the sediment is complex in the SDG area，west Sichuan Depression，Sichuan Basin. Considering the complex sedimentary characteristics in the Penglaizhen Formation of the SDG area，the sediment provenance direction was determined under the control of structure and sedimentary background through analyzing the stable heavy mineral and rock debris combination based on cores and measurements results from 25 cored wells and logging data of 313 wells. On this basis，the lithofacies type and their genetic environments were interpreted. Combined with the previous research results，the typical characteristics and identification marks of shallow water delta were dissected and then the sedimentary evolution characteristics were summarized to establish the sedimentary genetic model of shallow water delta based on the principle of“point-line-plane-volume”. The study results show that the SDG area has favorable geological conditions for the formation of shallow water delta，and the sand is characterized by fine granularity and wide distribution，but the single sand body is thin and small. The cumulative probability curves of granularity shows that the deposition was controlled by traction current which results in typical lithofacies combinations，and the deposited sand bodies have obvious fluvial-dominated characteristic at both sides of（underwater）distributary channels and their front，and the channel was reformed obviously. Based on the further exploration of sedimentary characteristics and sedimentary facies，five kinds of sedimentary models were put forward for shallow water delta，which are the model of fluvial-controlled blocky sand in delta plain，the model of fluvial-controlled blocky sand in delta front，the model of fluvial-controlled debouch bar in delta front，the model of tide-controlled sheet sand in delta front-prodelta transition zone and the model of tide-controlled far sand bar in delta front，and the model of tide-controlled far sand bar in delta front is proposed for the first time in the SDG area.