Abstract: Near-field Acoustic Holography(NAH) is a powerful tool in noise source analysis.However,accurate reconstruction requires dense measurement grid on large hologram,a huge number of microphones are demanded.It is significant to find a way to reduce the microphone number effectively while keeping high reconstruction accuracy in NAH implementation.On the basis of previous work,a hologram interpolation approach based on Support Vector Regression(SVR) is presented in this paper.Reconstruction accuracy can be improved significantly under small microphone number circumstance,therefore,a great amount of measurement points can be reduced by using the presented approach.In the numerical calculation of rectangle plane radiation,more than 70% measurement point reduction can be achieved in both two radiation cases,and other useful conclusions are also drawn.