  The detection and cross-section measurement of Coherent Elastic
Neutrino-Nucleus Scattering (CE{\nu}NS) are vital for particle physics,
astrophysics, and nuclear physics. Therefore, a new CE{\nu}NS detection
experiment is proposed in China. Undoped CsI crystals, each coupled with two
Photon Multiplier Tubes (PMTs), will be cooled down to 77K and placed at the
China Spallation Neutron Source (CSNS) to detect the CE{\nu}NS signals produced
by neutrinos from stopped pion decays happening within the Tungsten target of
CSNS. Owing to the extremely high light yield of pure CsI at 77K, even though
it only has a neutrino flux 60\% weaker than the COHERENT experiment, the
detectable signal event rate is still expected to be 0.074/day/kg (0.053/day/kg
for COHERENT). Low radioactivity materials and devices will be used to
construct the detector, and strong shielding will be applied to reduce the
radioactive and neutron background. Dual-PMT readout should be able to reject
PMT-related background, such as Cherenkov light and PMT dark noise. With all
the strategies mentioned above, we hope to reach a 5.1{\sigma} signal detection
significance within six months of data taking with a 12kg CsI. This
presentation will discuss the experiment's design, as well as the estimation of
the signal, various kinds of background, and expected signal sensitivity.
