The Jiangmen Underground Neutrino Observatory (JUNO) is a multi-purpose experiment which has a 20k tons liquid scintillator central detector 700 meters underground. The central detector is covered by about 17000 high quantum-efficiency 20-inch PMTs and 25600 3-inch PMTs. One of JUNO’s primary physics goals is measuring neutrino oscillation parameters. By observing oscillation behavior of the anti-neutrinos coming from the reactors around 52 km away from the central detector, JUNO can take precision measurement of 4 neutrino oscillation parameters sin2θ13, sin2θ12, Δm221 and Δm231. This poster will present neutrino oscillation parameter precision analysis based on latest knowledge of the experiment. It is found that JUNO will make a world-leading measurement of the neutrino oscillation parameters. For sin2θ12, Δm221and Δm231, their precisions can be determined to better than 0.5% precision in six years of data taking.