We presently read the chronicle, biography or monograph of Ou Yuan-hsiu which have wrong statement on his route sent on a diplomatic mission to the Liao. I thus collect some relative material, articles, paper and after my examination, I write his paper “The research on the route of Ou Yang-hsiu sent on a diplomatic mission to the Liao country”, not only make a clarification on Ou Yang-hsiu sent to the Liao, but also raise a reasonable statement.