| The characteristics of quantity fluctuation, source of seeds and seedlings, crop varieties, units of introduction, introduction purposes, planting areas，etc, were analyzed based on the data of the agricultural seeds and seedlings introduced from abroad to Shandong during the last 13 years. The results showed that seven new features of seeds and seedling introduction have appeared, including phased increase of the quantity with fluctuation, source globalization of seeds and seedlings, comprehensiveness of crop varieties, diversification of introducing units, diversified introduction purposes, decentralization of planting area and complexity of introducing channels. Eleven main potential phytosanitary risks were also analyzed, such as more categories of entry package, more workload for entry quarantine inspection, wider sources of plant pests, higher requirement of pest risk analysis, more pests carriers for spreading, more chances of pest introduction from the same original centre of the seeds or seedlings, diverse units for management, different models of planting and higher possibility of becoming pests after escape，larger area for pests monitoring and more cases of escaping or missing from inspections. The author suggested that it is in need of taking the strict precautions or regulation measures against the pest invasion. |
