To identify the accumulation characteristics and interactions of phenolic acids in continuous cropping tobacco-planted soils，the types and contents of phenolic acids in the extracts of soil in different planted years(4，6，8，14 and 16 years)in the same tobacco planting area were collected and determined using high performance liquid chromatography(HPLC)external standard method，and the accumulation characteristics and interactions of phenolic acids under continuous cropping conditions were discussed based on the curve estimation method and stepwise regression model.Eight kinds of phenolic acids were detected in different continuous cropping tobacco-planted soils and six of them had obvious accumulation trend.Curve estimation analysis showed that there were differences in the accumulation characteristics of different phenolic acids，and among them the accumulative trend of the growth curve was found for phloroglucinol，coumalic acid，p-hydroxybenzoic acid，vanillic acid and vanillin，and the ferulic acid content accumulated as a power function.Correlation and stepwise regression analysis showed that there was a mutual promotion relationship between the content of phloroglucinol and ferulic acid，ferulic acid had a promoting effect on the content of lauric acid，and vanillic acid had a promoting effect on the content of p-hydroxybenzoic acid.Lanthanol and benzoic acid had effect of promoting and inhibiting vanillic acid content respectively，vanillic acid and benzoic acid had a promoting effect on vanillin content.Therefore，under the experimental conditions，continuous cropping resulted in the accumulation of phenolic acids in tobacco-planted soil and there were differences in their accumulation characteristics.Phenolic acids have different degrees of promotion or inhibition and their mode of action depends on the type of phenolic acids.