There are three reasons. First, the body of Empress Dowager Cixi does not rot, but also depends on the cause of her death. According to records, Empress Dowager Cixi fell ill and died of dysentery, which is what we usually call gastroenteritis now. She can't eat, and it gives her diarrhea. It is said that when she finally died, she was severely dehydrated and had no food in her stomach. As we all know, the decomposition of a corpse begins with the stomach, and there is nothing in her stomach, so the decomposition of the corpse will be slower. Medical equipment was underdeveloped in Qing dynasty, and there was no good treatment for gastroenteritis. Think of the queen mother who ruled the Qing Dynasty for more than 40 years and died because of it. Who survived the disease?
Second, the non-decay of the corpse is also related to the climate at that time. It is said that Empress Dowager Cixi died in winter and will be buried in Qingling after her death. According to Beijing 100 kilometers, the traffic in Qing Dynasty was not developed, and it took at least half a month to walk from Beijing to Qingling. Because of the cold weather, the body of Empress Dowager Cixi did not rot, and the unique weather kept her body at a low temperature, which is also a reason.
Thirdly, the immortal body of Empress Dowager Cixi is related to the underground palace built. Generally, underground palaces are cold and humid. Friends who have been to Qingling know that the underground palace of Empress Dowager Cixi is still dark and cold even if the weather outside is unbearable. This environment largely ensures the low temperature of the body. It is conceivable that the body of Empress Dowager Cixi did not rot for various reasons, and it is not difficult to imagine why the Empress Dowager Cixi was still able to preserve the body without taking anti-corrosion measures in the Qing Dynasty.
Finally, after all, you can't escape the eyes of grave robbers. After the demise of the Qing Dynasty, grave robbers immediately stole all valuable things from Empress Dowager Cixi's underground palace.