The water (physical, chemical and biological) parameters can vary significantly due to the change of the climate conditions of water samples were collected monthly from four stations along the middle part of the Shatt al-Arab River during the tide and ebb phases from October 2021 – July 2022 to measure the change in eighteen parameters such as (Water temperature, pH, Turbidity, CO2, DO, EC, light penetration Secchi disc, water depth, TSS, total hardness, PO4, NO3, SO4, Na, Mg, Ca, K and FC)