To understand salinity status of fresh water and paddy soils and the susceptibility of rice to salinity stress of Gunnae reclaimed tidelands, salinitymonitoring was conducted in rainy and dry seasons. For fresh water, a high salinity was observed at the sampling location near the sluice gate anddecreased with distance from the gate. This spatial pattern of fresh water salinity indicates the necessity of spatial distribution of salinity in theassessment of salinity status of fresh water. Interestingly, there was significant correlation between rainfall amount and salinity, implying that salinityof fresh water varies with rainfall and thus it may be possible to predict salinity of water using rainfall. Soil salinity also higher near the gate, reflectingthe influence of high saline water. In addition, the groundwater salinity also high to threat rice growth. Though soil salinity status indicated lowpossibility of sodium injury, there was changes in soil salinity status during the course of rice growth, suggesting that more intensive monitoring ofsoil salinity may be necessary for soil salinity assessment. Our study suggests the necessity of intensive salinity monitoring to understand thespatio-temporal variations of salinity of water and soil of reclaimed tideland areas.