Abstract: One-dimensional Hall type angle sensor couldn’t measure angle from 0° to 360°,while（combined） angle measuring（technology） using four Hall devices and CORDIC algorithm could realize it.The paper described angle measuring principle and implementing algorithm of combined angle measuring（technology） using four Hall devices in details.And it introduced signed-magnitude notation,which used（amplitude） of sine and cosine to do arctangent CORDIC algorithm in 0°90° firstly,then realized angle mapping from 090° to 0360° according to different combination of positive or negative sign of sine and cosine（sign）.Simulation on Modelsim platform verified accuracy and precision of the method,with error less than（0.01%.） Total error of actual measurement was no more than 0.05°.