The approach to obtain a variety information of the radio anechoic chamber is presented. On the basis of geometric optics

the representation of fields in radio chamber in the three dimensional case is derived

from which the reflectivity and cross polarization coefficient concerning with both the transmitter and receiver antenna patterns can be obtained. In addition

according to the region of the transmitting and receiving points

the position of the reflected zone on each of the six walls is sought out. Consequently the arrangement of the absorbers on each wall can be selected and arranged to be more reasonable and economical. The numerical and graphical results are given.