Abstract: A new approach based on EMD and box dimension is proposed in this paper to detect the stationary and weak target Firstly EMD method is used to extract the low frequency component of the sea clutter and the box dimension of the low frequency component is calculated Then with the box dimension the stationary and weak target is detected Compared with the approach using the box dimension only, the effect of the stationary and weak target on the box dimension of the sea clutter is greater and the probability of the stationary and weak target detection is much bigger with this approach