In the power distribution system,the use of circular array Hall current sensor for current detection has a high accuracy,but the automotive electronics,aerospace and other fields require a high utilization rate of the internal space of the instrument,at this time because of its large space occupation will lead to practicality.To solve this problem,this paper proposes an error optimization algorithm for flat elliptic(AR≥2)array Hall sensors.Firstly,the circular array is transformed into AR=2 and AR=4 oval array by projection method,and the sensor size is reduced to save space. Secondly,the measurement errors caused by the eccentricity of the current carrying wire in the current detection process of the array sensor are analyzed,and the error optimization algorithm suitable for the flat elliptic array sensor is proposed.Finally,the wire eccentricity error of elliptic array sensors with different AR is tested,and the error optimization algorithm is verified.The experimental results show that the accuracy of the elliptic array sensor will decrease with the increase of AR.The maximum relative error of the elliptic array sensor with AR =4 can reach 33.36%,and the application of error optimization algorithm can reduce the relative error to 0.41%,which meets the measurement accuracy and greatly improves the practicability.