十三世纪上半叶,在蒙古的强大军事压力下,高丽被迫接连派出使团出使蒙古,现存两封《送晋卿丞相书》即为此背景下而作。但对这两封信的成书年代,学界有不同看法。本文通过详细论证,指出这两封信应分别作于1232与1238年。此外,通过这两封信与《与中山、称海两官人书》的讨论,本文认为必阇赤在蒙古宫廷对外交往中占有非常特殊的地位,高丽先后将耶律楚材及其同僚粘合重山、镇海作为重要争取对象,即与此有关。 In the first half of the thirteenth century, under the strong military pressure from Mongolia, Korea was forced to send another delegation to Mongolia in succession. The two extant books of “sending the prime minister of Jin Qing” were made under this background. However, the academic circles have different views on the years when these two letters were made. This article demonstrates in detail that these two letters should be made in 1232 and 1238, respectively. In addition, through these two letters and the discussion with “Zhong Shan and Zhong Guan Shuang Guan Ren Shu”, this article holds that Bi Yao Chi occupies a very special position in the Mongolian court’s diplomatic relations with foreign countries. Koryo has successively bonded Yelu and his colleagues Heavy Hill, Zhenhai as an important target for the fight, that is related to this.