Since the completion of the Forbidden City, there have been many historical mysterious cases, which have long attracted the attention and aroused speculation of countless people. So what is the truth of these suspicious cases? From Xingjing (Hetuala), Dongjing (Liaoyang), Shengjing (Shenyang) to Beijing, from Nurhachi, emperor Taizu of the Qing Dynasty, to the last emperor Puyi, these cases span a long time, and cover the emperors' family affairs and palace secrets, which are rarely heard for outsiders. Therefore, in the official history, official and private records, as well as notes and novels, there are diverse records of the same event because they are taboos for the emperors or fabricated stories, making them even more mysterious and making it more difficult to find the truth. This requires the identification of the false and the true based on historical data, revealing the historical truth of the event. The author, based on first-hand historical data, has selected more than 200 pictures, analyzed them one by one, and conducted detailed textual research to explore the clues of history and in order to discover the truth behind them.