Abstract: Abstract:According to the requirement on high tracking precision of the parabolic trough heat collector of solar thermal power plant in tracking the sun movement synchronously, the design scheme of hydraulic system used for synchronous tracking was given. It was verified by test that the tracking precision of the system reach ±0.1°, which can meet the requirement of the parabolic trough solar thermal power generation fully.

Key words: Key words:parabolic trough solar thermal power generation, hydraulic system used for synchronous tracking, sun trace transducer, tracking precision