Abstract: As we all know, the near field of underwater target acoustic scattering has time-space distribution. Its characteristics can be illustrated by the target time (equivalent to position)-aspect 2dimensional highlight distribution. The principle which is based on acoustic channel theory is reported here. Conjoining with sea trial results, some main reasons of target scattering are reviewed, their contributions to the 2-dimensional highlight distribution graphs of the target are also discussed. Finally, thephysical model of 2-dimensional highlight distribution of the target is presented.