In the electromagnetic calorimeter,longitude light collection uniformity of crystal scintillator has certain influence on the energy resolution.Monte Carlo (MC) method (using Litrani software package) is used to simulate the process of light transmission and collection in the long lead tungstate (PbWO₄ or PWO) crystal.Discussion focused on the influence of the absorption length and the face management on the light collection is presented.And comparison between anisotropic simulation and isotropic simulation is made.

The application of database technique for solving some problem in high energy physics analysis is discussed. By designing a connection program between the SQL language database and the software package PAW(Physics Analysis Workstation) commonly used in high energy physics analysis, the data processing capability, conveniency and practicability of PAW are greatly increased. This shows a new application field and prospect of databese technique in offline data physical analysis.