This paper describes the simulational technique and calculation of open jet gyroscope based on fluid-solid coupling. Using the ANSYS-CFX, fluid-solid coupling simulation is carried out through the steps as follow: building up 3D physical model; meshing; setting up coupling surface; loading and solving. This paper enhances the accuracy of simulational result by using bidirectional coupling. This approach improves precise of theoretical study on open jet gyroscope. The open jet gyroscope developing based on Coriolis Effect can be applied in rugged environment with the virtue of supporting high overload and low cost etc [1, 2]. Previous FEA of fluidic gyroscope are modeling based on flow structure. Vibration of solid load at flow boundary directly as in-built condition. This neglects the interaction between solid and fluid area inside of open jet gyroscope. It can not simulate accurately for fluidic gyroscope. As the result, it’s difficult for it to express the distribution condition of airflow velocity inside of the fluidic gyroscope. This paper study on the interaction between fluid and solid using fluid-solid coupling technique through 3D modeling. The simulational result has the higher level of authenticity and can optimize the structure gradatim and shorten the design period.