The Huanghe River tail (HRT) has changed channels twice since 1964, Diaokouhe Channel (from Jan, 1964 to May, 1976) and the Qingshuigou Channel (from May, 1976 up to now). In the Diaokouhe Channel period, the river tail flowed roughly northward into the Bohaiwan Bay, but since May, 1976, has flowed into the Laizhouwan Bay from the Qingshuigou Channel. The major results of the analysis on the distributional features of the Huanghe River Diluted Water (HRDW) in both periods are presented in this paper as follows. (1) In the Huanghe River (HR) flood season the HRDW exists off the water-running mouth and is different from the Baonan coastal water. The core salinity of the HRDW is less than 27 and its thickness is not greater than 10m. The HRDW salinity at its outer boundary can reach 29.5, with corresponding thicknees not greater than 15m. (2)In the flood season,the behaviours of the HRDW are different not only in the different HRT periods but also in the different stages of the same HRT periods.(3) The extent and direction of the HRDW not only has monthly variations due to the HR’s mean runoff discharge but also reveals a weekly fluctuations owing to the intermittent runoff in the HRT. (4) During the period of the Qingshuigou Channel, generally speaking,the HRDW spreads northeastward in the flood season, but the spreading direction is significantly affected by flood_ebb process, which is to say that the flood tide cause the HRDW to spread to the southeast and the ebb tide to the northeast.