Abstract: Based on the observed data in the wandering reach at the lower Yellow River,the adjustment of river regime is analyzed.The results show that the wandering position of the mainstream line in the direction of river width has a statistical rule though the river regime at the wandering reach is inconstant.The regulation between the string height and the string length of the mainstream line accords with a function relationship between the bow parameters.The bending radius reduces with increasing length of the mainstream line,and then tends to be relatively stable.The statistical relationship between the bending coefficient and the length of the mainstream line and bending radius shows that the river regime at the wandering reach of the lower Yellow River has some obvious characteristics,where steep bends are liable to take place and make the bend more wandering. There is a correlation tendency between the bending radius and river width,the wider the river,the more the increasing probability of the bending radius.