Abstract: Based on Malmquist index method， the inputoutput data of 15 major live pigproducing regions from 2004 to 2012 in China were adopted to measure the breeding efficiency change of Chinas scale pig and analyze the regional diversities under different breeding scales. It was shown that all the breeding scales exhibited a positive growth in breeding efficiency from the perspective of the nationwide average Malmquist index. The smallscale breeding showed the highest breeding efficiency， while the largescale breeding exhibited the lowest efficiency. On the provincial and regional level， even in the same scale breeding， breeding efficiency varied among different regions in different provinces. According to the sequential change from 2004 to 2012， the changes of breeding efficiency in three breeding scales were almost the same as a “W” shape.

Key words: scale pig, breeding efficiency, regional diversities, DEAMalmquist index