[Objective] The aim of the research was to discuss the relationship between pH value and the extraction rate of DNA.[Method] With fresh pig livers as research materials,five different pH values were set up based on conventional DNA extraction method.And the effects of different pH values on the extraction rate of DNA were analyzed.[Result] OD value had certain relationship with pH value.When pH value was 7.4,OD value was most and the extraction rate of DNA was highest.The farther the pH value was from this ...