Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China
; PLA, Inst Chem Def, Beijing 102205, Peoples R China
; Acad Sinica, Inst Phys, Taipei 11529, Taiwan
TEXONO collaboration adopts CsI(T1) crystal calorimeter to measure the energy spectrum and abnormal magnetic moment of reactor neutrino. The paper describes the design of shielding; the main source of backgrounds and the Monte Carlo Simulation based on the GEANT3 code for the effect of the shielding.