  The Korea Invisible Mass Search (KIMS) collaboration has been carrying out
WIMP search experiment with CsI(T$\ell$)crystal detectors at the YanYang
Underground Laboratory. A successful reduction of the internal background of
the crystal is done and a good pulse shape discrimination is achieved. We
report the first result on WIMP search obtained with 237 kg$\cdot$days data
using one full-size CsI(T$\ell$)crystal of 6.6 kg mass.
