The tight sandstone of Liushagang Formation is one of the important targets for the exploration and development of the Fushan Oilfield in Hainan. Affected by complex structural evolution， the tight sandstone in this area has the characteristics of obvious thin interbedded sand and mud， low porosity， low permeability， and high temperature. In order to solve the problems such as high operation pressure， out-of-control fracture height， sand plugging， and low single well output and rapid output decline after fracturing in the past reservoir treatment， drawing on the unconventional reservoir volume fracturing technology， tests were conducted in four wells in the tight sandstone of Fushan Oilfield with the use of variable displacement and artificial barriers to control fracture heights， temporary plugging for fracture direction change， as well as optimization of fracturing fluids， and application of nano-synergy oil washing agents. The research results show that unconventional reservoir volume fracturing technology can effectively reduce the risk of sand plugging and improve the stimulation effect of tight sandstone reservoirs in Fushan Oilfield. The implementation of reservoir reconstruction techniques such as variable displacement， artificial barriers to control fracture heights， and temporary plugging for fracture direction change have effectively controlled fracture heights and increased the open degree of the reservoir. The application of the nano synergistic oil washing agent minimizes the damage of the liquid to the formation and fractures， exploits the effect of nano droplets to absorb and wash oil， and increases the stable production period of oil and gas wells.