Through researching the parameters of bubbly screen in the ship wak e,the bubble movement characteristics can be found out．Also,the research and realization of the ship wake self-guide torpedo are based upon this characteristic.Currently,the wake research shortcomings include the me asuring is complex,the measured value is susceptible to be impacted by the external environment,etc.From a new point of view,the norm theory is applied to measure the parameters of the ship wake bubble．A slice imaging syste m ba sed on light sheet is used to acquire the ship wake bubble screen images in the experiment．We utilize the nor m al gorithm and the diameter size of the bubble to acquire the bubble density,uniformity distribution and the volume density of the bubble screen. According to the above parameters,the related information of the target ship can be analyzed and judged.The norm algorithm has many advantages compared with the conventional one,such as the les s known information is needed, the algorithm is simple,the information obtained is informative,the judgem ent of the ships condition is accurate,and so on.This algorithm is expected to be used in acquiring the param eters of bubbly screen in the ship wake,and will have significant applications in the ship wake bubble screen research.