Gluco-amylase is an important part of enzyme market in China, most of which is exported. In recent years, the capacity and output of gluco-amylase have been increasing but at a modest rate. However, gluco-amylase's economic profit is usually unsatisfactory due to the large investment needed and its low price, especially for domestic market-oriented factories. Production situation of gluco-amylase has been gradually concentrated in large producers these years, while the small ones' market share has been shrunken.