Abstract: Inter-regional biological invasion is a new concept, which is defined as the invasion of alien species from one region to another region within a country. Because of the intensive personnel- and goods flow and its difficulty to control, the inter-regional biological invasion is now very serious in China. Based on the cases of the inter-regional biological invasion at home and abroad, this paper analyzed the main pathways of the invasion and its dangers, and put forward some countermeasures. Alien species introduction, transportation, and anthropogenic disturbances are the main pathways of the inter-regional biological invasion, which can cause the native species extinction, genetic contamination, and biodiversity decrease,etc. Some future research directions on the inter-regional biological invasion in China, including climate change, South-to-North Water Diversion Project, and Cross-Straits exchanges, were proposed.

Key words: Sanjiang Plain, Wetland, Soil, Total sulfur