Hydraulic system as well as brake method and boosting method thereof

The invention discloses a method for braking and boosting by the characteristics of a hydraulic system. The hydraulic system comprises a hydraulic motor, an oil inlet path, an oil returning path, a hydraulic pump, a first solenoid valve, a second solenoid valve, a third solenoid valve and an energy accumulator, wherein the oil inlet path is connected with a first cavity, and the oil returning path is connected with a second cavity; the hydraulic pump charges oil into the hydraulic motor via the oil inlet path; the first solenoid valve controls the oil inlet path to be communicated with the hydraulic pump; the oil inlet path is connected to the first cavity by the third solenoid valve; and the energy accumulator is connected to the first cavity by the third solenoid valve and is connected to the second cavity by the second solenoid valve. In a hydraulic winch adopting the hydraulic system, a winding drum can be braked and buffered in the cable unreeling process, the equipment maintenance cost is lowered, the e