The Jiangmen Underground Neutrino Observatory (JUNO) uses a 20k ton liquid scintillator detector to capture medium-baseline reactor neutrinos to measure the neutrino mass ordering. Event reconstruction is one of the key challenges in reaching the designed energy resolution of 3%/sqrt(E). This poster presents a data-driven construction method of the expected photo-electron distribution of positron, and a maximum likelihood vertex and energy reconstruction method that combines the charge and time information of PMTs. The energy non- uniformity of this method is < 0.5% inside fiducial volume. The preliminary effective energy resolution is about 2.9% at 1 MeV.