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Amino trimethylene phosphonic acid (ATMP) is a common scale inhibitor using in oil field that always combines with a variety of surfactants and auxiliaries. It is necessary to know its solubility for purifying and combining. With a laser monitoring observation technique, the solubility of amino ATMP in binary solvent mixtures were measured by using the isothermal method from 298.15 to 343.15 K. Results of these measurements were correlated by the combined nearly ideal binary solvent (CNIBS)/Redlich-Kister equation. For these data studied, the CNIBS/Redlich-Kister equation was found to provide an accurate mathematical representation of the experimental data.