Abstract: Adaptive array processing can greatly improve anti-interference capability of communications and radar systems,and thus has wide applications.Many important high-speed adaptive array processing algorithms include a series of Givens rotations,which transform an input data matrix into a triangnlar matrix.A typical Givens rotation has square-root operation,which is one of the key factors limits the algorithm speed.This paper presents a new method to implement the Givens rotation without root operation based on coordinate rotation digital computer (CORDIC).The derivation of the method,the structure of the operation node,and a simulation result of QR-Decomposition adaptive algorithm based on the method are given in the paper.