Hydrostatics studies the mechanical laws of liquid in static or relatively static state and its application, and discusses the pressure distribution inside liquid, the pressure of liquid on solid contact surface, the buoyancy of liquid on floating body and submerged body and the stability of floating body, so as to solve the problems of water storage containers, water pipes and canals, water retaining structures and structures floating in water such as pools, water tanks, water pipes and gates. Static load calculation of dams and ships.