清代长篇白话小说《绿野仙踪》近来益受学界瞩目,研究成果日丰,然困扰研究者近百年的难点,即作者李百川的生平家世问题,并无突破。其乡贯是南是北,山左山右,迄无定论。笔者近检光绪《蔚州志》(庆之金、杨笃纂修,光绪三年刻本),觅得李百川家世的重要线索, Recently, the long novel vernacular “The Wizard of Oz” in the Qing Dynasty caught the attention of scholars and the research achievements were abundant. However, there were no breakthroughs in the author’s life and family problems, which confronted the researcher nearly a hundred years. Its countryside is South is North, Mountain left, up to inconclusive. I close inspection Guangxu “Yuzhou Zhi” (Qing Jin, Yang Du compilation, Guangxu three years engraved), find Li Baichuan important clues to the family,