Abstract: Sulige gas field in Ordos basin belongs to typical large tight sandstone gas reservoirs. According to its geological characteristics such as multiple series bearing gas and poor lateral continuity of sand bodies, a three-dimensional mixed large well pattern development technology has been developed. Based on the period division of composite sand body vertically and planar division of single-period channel sand body, 4 effective sand body superimposition modes such as isolated mode, incising superimposition mode, stacking superimposition mode and lateral connection mode are identified. In-situ interference test and gas reservoir engineering demonstration method are used to optimize well pattern and a mixed well pattern is established according to the different sand body superimposition modes and the reservoir features. Considering the advantages of horizontal well, vertical well and directional well, the three-dimensional mixed well pattern development technology has been established for large well groups in multiple series of Paleozoic. With the technology the three-dimensional reservoir development and one-off producing of the whole reserves have been realized in the fluvial sandstone reservoirs of Shan 1 member and He 8 member and in the marine carbonate reservoir of the fifth member of Majiagou formation, the producing degree of reserves has been effectively improved, the development cost has been reduced, and finally the economic and efficient development of the gas field can be guaranteed