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Abstract [Objective] This study aimed to detect the purity of Shanxi lean meat pigs. [Method] Eight primers were selected and used in the DNA fingerprinting technique amplified fragment length polymorphism （AFLP） to detect the purity of 30 Shanxi lean meat pigs. [Result] A total of 206 AFLP markers were obtained; 3-15 bands were obtained from each primer. The similarity index of population in Shanxi local pigs was 0.931 on average. [Conclusion] AFLP is suitable for detection of genomic DNA, and the genetic purity of SD-Ⅲ line is higher.