Focusing on the problem of high computation complexity of MUSIC algorithm which is used for joint polarization-DOA estimation of conical conformal array, the signal model of conical conformal array is established and is built by single polarizative elements. Through the building of same polarizative sub-array, the polarization and DOA information of steering vector is de-coupled, considering the shadow effectors of conformal array, dimension reduced MUSIC is derived by rank reduction theory, which realizes polarization-DOA estimation by less computation complexity. The method has been verified by computer simulations.