Aiming at the defects of the large mean square error or failure in equalizing higher-order non-constant modulus signals for Super-Exponential Iteration blind equalization algorithm(SEI), a parallel soft switching Coordinate Transformation Super-Exponential Iterative Decision Directed blind equalization algorithm (CTSEI-DD) was proposed. In this proposed algorithm, coordinate transformation method is introduced into the Super-Exponential Iterative blind equalization algorithm to obtain Coordinate Transformation Super-Exponential Iterative blind equalization algorithm(CTSEI), CTSEI is combined with the Decision Directed algorithm in soft switching way. Accordingly, the proposed algorithm has many advantages such as fast convergent rate, small mean square error, and the high performance in equalizing higher order QAM signals. On the basis of testing the performance of the proposed algorithm and obtaining its relative parameters, the codes are written in C language in Code Composer Studio(CCS) integrated development environment software and debugged, the proposed algorithm is implemented on the Digital Signal Processor(DSP).