Abstract:The study was conducted in high production agro-ecosystem in Huantai County Shandong Province of China North plain to study the impact of organic input and chemical fertilizer application on earthworm population. The result shows that there were seven species in Huantai high production agro-ecosystem, Among the seven earthworm species, Aporrectae trapezoids is the dominant species. The average earthworm population is 83.83 indiv./m~2. The highest population density was found in August 1998 among the five su...