Pork pH value is an important trait related to meat quality, the trial has screened the SNP-QTL associated with pork pHI and pHU from genome wide SNP screening in a Danish swine predgree. The result indicated there was a QTL on chromosome 6 which was associated with pork pHI and pHU value signficiantly. Effect value of QTL associated with pHI significantly was between 2.6%~8.5%, FLJ30670 locus had a strong effect on pHI and it took 8.5% of total variation, while effect value of QTL associated with pHU significantly was 2.1%~4.3%, all of which were lower than pHI related effect of them, the FUT1 locus had a strongest effect on pHU and it took the 4.3% of total variation, indicating acidity of pork within 24 h was more likely to be affected by other environmental factors.