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Synechococcus sp., the hypersaline Cyanobacterium form, produces extracellular products under high salinity and high intensity of light. The excretion of large amounts of extracellular material caused an additional increase in brine viscosity. An experiment was undertaken using twelve aquaria filled with brine. Measurements were made of salinity , viscosity and the amount of organic materials at the high and low light intensity . Relative viscosity and the amount of organic materials were higher in conditions of high salinity and high light intensity, because under these conditions Synechococcus produced more extracellular products. Therefore these can decrease the quality and quantity of salt produced in solar salt field which is economically important to understand the effect of these extracellular materials in these environments.