Abstract: The fluid-controlled sliding sleeve is the core tool in the intelligent completion system, which controls the fluid production in different intervals through the sliding sleeve opening, closing and opening degree changes. How to calculate the switch pressure of the piston is an important problem that needs to be solved in the design of the intelligent sliding sleeve. This paper analyzes the relationship between the switch pressure and the friction force of the intelligent sliding sleeve, and analyzes the main factors which affect the switch pressure. A set of calculation methods for calculating sliding sleeve switch pressure are summarized. The switch pressure of the fluid-controlled sliding sleeve is calculated.Through many experimental verifications, the result shows that the difference between the theoretical calculation and the measured average switching pressure is only 4%, which verifies the accuracy of the calculation and analysis. It is great significance for the following optimization design of hydraulic control sliding sleeve and the application of intelligent completion system in offshore oilfield.