Purpose: wherein a resource of water supply upstream is mounted for a river mouth fill, the ecological restoration method in one river, one ecological river and using an identical river mouth dike be arranged to obtain fish material, by restoring the ecology of river mouth dike and river, and extra large ecology and the inhabitation for promoting anadromous fish species. Construction: wherein a resource of water supply upstream is mounted for a river mouth fill, and a kind of ecological restoration method in a river includes the following steps. The downstream of one river (1) is split with a river mouth dike (3). The formation of lower reaches of a river to sea to open. One fresh water soakage device (7) is mounted, and passes through one movable barrage of blocking (6) upstream in river. Aggregation fresh water be supplied to river mouth dike upstream. Water, stay in streamflow upstream to lower reaches of a river. One water purifier (9) is installed in the rear end of soakage device or the fresh water inlet part upstream of river mouth dike.
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