A novel Laser screen velocity measuring method with large effective screen area is introduced for some special velocity measuring occasions like wide spreading range or big-size flying objects.

The method of stack velocity analysis based on relief surface presented in the paper uses double-square-root equation to compute the travel time of reflections, which is suitable to use in the area w.

The error caused by the ring method of equivalent area to measure the mean velocity of the circular pipe is studied by the different now pattern.