Abstract: A joint multiple parameters estimation for cylindrical conformal array is proposed in the absence of coupling degree of freedom in this paper. To solve the problem of multiple parameters mutual coupling in the cylindrical conformal array ,firstly the ESPRIT subarray is acquired through that the sensors are arranged appropriately with the utilization of single curvature characteristic of cylindrical conformal carrier. The degree of the mutual-coupling and elevation angle of source are realized through searching for the degree of the mutual-coupling and ESPRIT algorithm. Then, based on rank-reduction theory, as well as that mutual-coupling is Toeplitz matrix, the azimuth angle is realized by one-dimensional parameter search. It also gives detailed analysis on possible azimuth ambiguity, with corresponding solutions. Finally, making use of TLS-ESPRIT algorithm, group of equations are created. The polarization and mutual-coupling coefficients are estimated by solution of the group of equations. Monte-Carlo simulation results are provided to demonstrate the effectiveness of the proposed method.