Soil acidification and poor fertility are common problems of paddy fields converted from dryland.Exploring the effects of soil amendments and organic fertilizer application on the latosol soil improvement of paddy fields could providescientific basis and technical guidance for the paddy fields in southern red soilregions.The field experiment was conductedand orthogonal experiment design was adopted to study the effects of soil amendments(lime，silicon -calcium-potassium-magnesium，and plantash)and organic fertilizers(straw，sheep manure and mixed fermentation organicfertilizer) on the soilpHvalue，organic mattercontent，number of soil microorganisms and soilnitrogen，phosphorus and potassiumcontents.The results showed that the application of silicon-calcium-potassium-magnesium under flooding conditions significantly increasedsoil pH value after 15 days of riceplanting，but the increase wassmall.The application ofstraw，sheep manure and mixedfermentation organic fertilizer significantly increased soil pHvalue，organic mattercontent，total number of microorganismsand soilnitrogen，phosphorus and potassium contents.When the total amount of organic fertilizer exceeded 90 t/hm²，therice lodging rate increased with the organic fertilizerapplication.Therefore，the application of organic fertilizer is an effectivemeasure for soil improvement in paddy fields converted form dryland，but soil improvement and soil fertility increase must beimproved step bystep.It is not advisable to over -apply organic fertilizer at onetime.The best application rate is 90 t/hm².