Most of the acid flow along the fissures on the acid fracturing process,a small number of filtration, the experimental of acid conductivity is test in the lab,the rock sample selection of ordos basin carbonate reservoir dolostone,the experimental test the conductivity influence on acid type, contact time and injection velocity under different closure pressure,the experimental control the temperature of 100 ℃, draw a conclusions: 1、gelled acid, crosslinking acid, diversion acid three acid system,it is difference in the test by conductivity experimental study, the results showed that the capacity of diversion acid is strongest. 2、for some acid system, the acid-etching fracture capacity does not always increase with acid rock reaction time, the acid-etching fracture capacity is declined in the longer acid rock reaction time, it shows that there isthe best time to acidification in acid fracturing process ; 3、the experimental study showed that the capacity increase with the increase of acid flow velocity under flowing rate of acid 500 ml/min, 800 ml/min, when acid injection rate is 1000 ml/min,it is the higer that acid-etching fracture capacity; Based on the experimental theory study, the important guidance has been got in acid fracturing design for more accurate provide important .