Abstract: A field plot experiment was conducted to study the effect of organic fertilizer on soil salt accumulation and pH changes in greenhouse. The result showed that: the greenhouse soil application of organic fertilizer could also increase soil salt content, but the cumulative amount gradually decreased with increasing usage. Compared with chemical fertilizer, soil salinity cumulative amount could be reduced from 9.22% to 21.13% by using chicken manure, and from 9.40% to 27.59% by using pig manure. But there was not obvious difference between commercial organic fertilizer and chemical fertilizer. Salt cumulative amount was even more than chemical fertilizer in low application treatment. Different seasons had different effect of organic fertilizer on soil salinity. In the same chicken manure treatment, soil salinity was 19.10%-64.18% higher in summer than in winter. There was similar result in pig manure treatments. The application of commercial organic fertilizer had little difference in vary season. In green house, application of chemical fertilizer reduced soil pH. In contrast, application chicken manure, pig manure increased soil pH to avoid soil acidification. Commercial organic fertilizer was not obvious to reduce soil pH. Chicken manure, pig manure could delay the soil salt accumulation speed, avoid soil acidification might be appropriate applied. But commercial organic fertilizer ineffective should be used cautiously.