(一) 自1985年云南省政府颁发了关于发展边境贸易的文件以来,云南的边境贸易进入了一个大发展时期。到1992年,边贸总额已由过去的每年几千万元增加到20多亿元。可是,在众多的边贸商品营销中,有色金属及其有关产品在相当一段时间内几乎处于停滞状态。深究其原因,一是对云南沿边对外通道口岸营销的有利外部环境与内部条件缺乏探 (1) Since Yunnan Provincial Government issued the document on developing border trade in 1985, Yunnan’s border trade has entered a period of great development. By 1992, the total amount of border trade had risen from tens of millions of yuan each year to more than 2 billion yuan. However, in many marketing of border trade commodities, non-ferrous metals and related products have been at a standstill for quite some time. To explore its causes, one is the lack of exploration of the favorable external environment and internal conditions of the ports of entry along the Yunnan border