In order to find out the soil pH value status of Malong tobacco planting area and provide scientific basis for soilconservation，214 soil samples were collected in Malong tobacco plantingarea.The results showed that the average pH valueof Malong tobacco planting soil was5.43，pH values of 61.21% soil samples were less than5.5，38.79% were greater than5.5，and the average pH value of tobacco planting soil for each county was between 5.18～5.66.The results of geostatisticalanalysis showed that the spatial structure of soil pH value met with exponentialmodel，and the spatial variability was mainlydetermined by random factors and structuralfactors.The spatial distribution of soil pH value was flower -arranging in differentgrades.The results showed that availableCa，availableMg，soiltype，alkali-hydrolyzableN，soil texture and available Swere the main factors affecting soil pHvalue.The accumulative explanatory ability of six indicators to soil pH value of tobaccoplanting reached86.2%.Amongthem，the independent explanatory ability of available Ca was thelargest，which couldexplain 50.9% of thevariation.Available Ca and available Mg were the main acid controllingfactor，and alkali hydrolyzed Nwere the main soil acidfactors.The results provided a theoretical basis for the improvement of acidic tobacco plantingsoil.