Plastic greenhouse soil salinization has become a prominent problem for greenhouse sustainable production.The research collected the typical secondary salinization plastic greenhouse soils in Yunnan province,and selected soil conditioner,biochar,commercial organic fertilizer and pig manure for pot experiment to study the effects of exogenous organic materials on the improvement of salinized soil.The results showed that(1）Application of biochar and commercial organic fertilizer effectively improved the secondary salinization greenhouse soil texture,reduced bulk density,improved the total porosity.(2）Exogenous organic materials significantly improved greenhouses salinized soil,not only reduced soil total salt and EC value but also improved crop yields.(3）The dominant cation was Ca2+,and the dominant anion were NO-3 and SO2-4.Commercial organic fertilizer,biochar and pig manure better reduced the contents of Ca2+,NO-3and SO2-4.(4）The improvement of biochar for salinization greenhouse soil was better than the other three kinds of organic materials.