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The primary emphasis of this research was to investigate the foundations of phthalate (PAEs) pollutant source researches and then firstly confirmed the concept of the coefficient of volatile strength,namely phthalate total content in per unit mass and unit surface area of pollutant sources.Through surveying and evaluating the coefficient of volatile strength of PAEs from typical plastic products,this research carried out reasonable classification of PAEs pollutant sources into three categories and then investigated the relationship amongst the coefficient of volatile strength as well as other environmental factors and the concentration level of total PAEs in indoor air measured in environment chambers.Research obtained phthalate concentration results under different temperature,humidity,the coefficient of volatile strength and the closed time through the chamber experiment.In addition,this study further explored the correlation and ratio of influencing factors that affect the concentration level of total PAEs in environment chambers,including environmental factors,the coefficient of volatile strengths of PAEs and contents of total PAEs in plastic products.The research created an improved database system of phthalate the coefficient of volatile strengths of each type of plastic goods,and tentatively revealed that the volatile pattems of PAEs from different typical plastic goods,finally confirmed that the coefficient of volatile strengths of PAEs is a major factor that affects the indoor air total PAEs concentration,which laid a solid foundation for further establishing the volatile equation of PAEs from plastic products.