It is not recognized as conclusive, but he recalculated years of the history according to "Double Year Theory" which says in "Weilue (Brief Account of the Wei Dynasty)", a half year of the present was counted as a year at that time in Japan, and as a result, he asserts that Emperor Jinmu was enthroned in 181 and his life duration was 63 years, half of 127 years.
決定的とは認知されていない説だが、『魏略』には現在の半年を当時の日本が一年として数えていたという『倍年説』を基に歴史を再計算しその結果、神武天皇の即位は西暦181年であり、寿命は127歳の半分の63歳であったと主張している。