The studied area forms a part of the coastal basin on the east coast of the Mediterranean Sea located north of Tartous city.The area is bordered by the Mediterranean Sea from the west. And (jobar,banias, albasia) rivers from north, al Housen river from the south. The area covers about (358) km2. The research aims to find arelationship between rainfall and flow within Mrqiyeh River Basin, by conducting analytical statistical study using Minitab software, which helps in completing the measurements are not available, and to predict the river flows depending on the expected precipitation in the river basin. The study found that the relationship is:Q = 216 + 0.0379 P - 36.8ln (P) + 3.46ln(Q) ,and rainfall reflect 87.2% of the changes that occur to the flow of the river. The study recommended that need to intensify the river discharges measurements in order to increase the reliability of their data.