This paper proposes a dynamic data stream trend analysis algorithm based on incremental recursive least squares method. It uses incremental computation to quickly detect the data stream segmentation point and determine the segmentation, so it has strong real-time performance. At the same time, it adjusts online according to the new arrival data stream element. For the trend parameter, the generalized likelihood ratio is used to detect the segmentation point, so the accuracy of the trend analysis is significantly improved [4-6].