The Qing Shui Gou Stream into the estuary of the Yellow River experienced the following changing periods: First it began with the wandering channel pattern, then the straight channel pattern, till at last meandering channel pattern. At the same time, the at last meandering channel pattern. At the same time, the scouring and deposition changes of the stram also experienced three periods: 1) the deposition with the channel wandering 2)the scouring which makes the channel formed 3) the deposition which makes the estuary extedn. These changes have some deep effects on the channel longitudinal profiles, the water level and the dangerous situation. The study of these changes and effects is of great instruction to the preventing disasters, the harness and the course change by engineering-measures of the estuary reach of the Yellow River.