Absorbing materials combined with shims are used for filling the absorbing chamber,it makes the structure of the system more sample,the manufacture and repairing cost cheaper.The “tri-point circumferential uniform distribution” used in the absorber system to assemble the absorbers,limits the angular displacement of X,Y and Z axis of the EO tracing equipment.Finally,the absorber system satisfies the precision requirements of the EO tracing equipment by choosing suitable parameters.