A novel configuration design of two path optical Add/Drop OADM multiplexer used in DWDM all-optical communication network is presented in this paper. It composes of polarization beamsplitter, λ/4 waveplate, right-angle prisni, total reflection mirror, and polarization light modulator. One path or two path different wavelength signals can be added or droped from the main optical path by division and recxxnbination of the p- and s-polarization components of the optical signals under the oontrol of polarization light modulator. It has the features of flexibility, polarization indeoendent, less optical elements, compact constitution, and easy to packaging.