Abstract: “Six Signs Must Be An Earthquake” comes from the chapter “Earthquake” of 1935’s “the Rebuild of Longde County Records”, originated from “Six Signs of an Earthquake” of “Earthquake Solution” written by Long Huamin (Nicolas Longobardi). “Earthquake Solution” is translated from Commentarii Collegi Conimbricensis Societatis Jesu on “Astronomy”. “Six Signs Must Be An Earthquake” have been proved mainly believable by lots of ancient and modern earthquakes, but also have the boundedness. The author of the chapter “Earthquake” is very courageous and knowledgeable by summarizing “Six Signs Must Be An Earthquake”. His outstanding contribution and innovation are worthy of future generations to learn and carry forward.