Pork traceability system in China has been built for many years，failed to achieve an effective traceability，restricting the traceability system of quality and safety.Based on field survey of 183 pig farms，4 pig slaughtering enterprises and 197 pork sellers，this paper empirically analyzes causes and countermeasures of difficulties to achieve traceability of pork traceability system from the perspective of industry chain.The results indicate as follows：traceability system traceability system is still difficult to achieve，every link on the pig industry chain exists difficulty，and the construction of pig breeding areas of the ear tags and archives，pig slaughter and quarantine inspection，entry system，the identification of pork，pork sales link to purchase a small ticket，are the keys to the realization of the traceability.For the cause of difficulties to achieve traceability of pork traceability system on each link of the pig industry chain，the government should encourage the scale and standardization of pig breeding，encourage some pork production operators to actively explore suitable for the enterprise's own pork traceability management model，establish and improve the system of different types of sales management，increase publicity efforts on traceability system，and so on.