The Guanhe River has wide shoals and excellent waterways,which is unique in the north Jiangsu Province that has no dam in its main stream.Estuarine flux is the key parameter in estuarine regulation and environment protection.In order to investigate the transport of salt and suspended sediment,the spatial distribution of salinity and suspended sediment and the temporal variation of spring-neap tide and intra-tide were discussed using a flux decomposition method on the basis of field data.The results show that the fluxes of salinity points to downstream in the shallow zones near the convex bank and to upstream in the channels near concave bank in the curve segments.The suspended sediment fluxes points to upstream near the left bank and to downstream near the right bank during the spring and neap tide.The directions of the flux of salinity are NNE-NE and changes slightly with different river discharge in outer zone.The suspended sediments are transported along WNW-NNE in remote area,while upstream at G2 near the river mouth.T1,T2and T4 are the dominate components of salinity and suspended sediment fluxes,and the characteristics of flux composition is similar between spring and neap tide.The direction of net suspended sediment flux is not always as same as the tidal velocity at maximum ebb or flood.Net upstream flux might be induced at maximum ebb due to sediment concentration is lower than its tidally-averaged value.