康熙二十四年(1685)和二十五年,由于俄兵在雅克萨之役中败于清兵,俄国表示愿与中国商谈和约。南怀仁闻此,料想中俄和约签订以后,西伯利亚通道必无问题,于是在中俄谈判前夕,加紧了在开通这一陆路方面的努力。1687年10月1日,南怀仁口授他的秘书、比利时耶稣会士安多(Antoine Thomas)给耶稣会总长戴努耶尔写了一封信。在西伯利亚通 Twenty-four years (1685) and twenty-five years of Kangxi’s reign, Russia said it was willing to negotiate a peace treaty with China as the Russian soldiers lost their lives in the battle of Jaffa. South Huaren heard this and expected that after the signing of the Sino-Russian peace treaty, there will be no problem in the Siberian Passage. As a result, on the eve of the Sino-Russian talks, the efforts to open this land route have been intensified. On October 1, 1687, South Wyeren dictates his secretary, Antoine Thomas, a Jesuit of Belgium, wrote a letter to the Jesuits General Dinuyer. Pass in Siberia