%0 Journal Article %T Are there real orthogonal polarization modes in pulsar radio emission? %A R. X. Xu %A G. J. Qiao %J Physics %D 2000 %I arXiv %R 10.1007/BF02897168 %X The Orthogonal Polarization Modes (OPM) have been reported observationally and accepted widely by pulsar researchers. However, no acceptable theory can show the origin of the OPM, which becomes a mystery in pulsar research field. Here a possible way to solve this mystery is presented. We ask a question: Does there exist any real so-called OPM in pulsar radiation? It is proposed in this paper that the `observed OPM' in individual pulses could be the results of depolarization of pulsar radiation and the observational uncertainties originated from polarimeter in observation. A possible way to check this idea is suggested. If the idea is verified, the pulsar research would be influenced significantly in theory and in observation. %U http://arxiv.org/abs/astro-ph/0007056v1