Daya Bay Reactor Neutrino Experiment*

The Daya Bay reactor neutrino experiment, currently under construction in China, will be the most sensitive experiments in the world searching for the yet unknown neutrino mixing parameters, theta-13($\theta _{13})$.~ With a thermal power of 17.4GW by 2011, the Daya Bay site provides an intense electron antineutrino flux, which together with 3 years of data taking from 4 pairs of identical detectors at far and near locations, optimized baseline with large rock overburden and active water shielding, up to 80 tons total target mass comprising Gd-doped liquid scintillator and comprehensive, redundant calibration measures, will lower the upper bound on sin$^{2}$2$\theta _{13}$ to 0.01 or better.