Yuejiu Xi is a native farmer in Nong 'an County. This year, he has passed the age of no doubt, but he has rich experiences that others can't match. He raised fish, opened a shop and was addicted to racing. It is these experiences that laid a solid foundation for his inventions, making some of his inventions seem ubiquitous, such as game health seasoning, canned lettuce in sugar water, and small emergency power generation rescue vehicles. At present, the State Patent Office has accepted wrist lock device for police riot prevention, waist lock device for police riot prevention, automatic contraction safety traction belt and cardiac rescue. The reason why the invention project is so complicated is because of experience and utility. Many of his inventions borrowed from other existing principles, then redefined the combination and invented many ingenious things. He told reporters about the process of inventing the automatic retractable safety traction belt, which looks as simple as putting an eraser behind a pencil. He has seen many times that when towing a faulty car, because the tractor often brakes, the rear car does not brake, and the traction rope often rolls under the wheel to cause damage. So he invented an automatic telescopic traction rope based on the principle of tape measure. Once the tractor brakes, the rear car will slip for a short time, but the traction rope will automatically rewind, and it will not drag on the ground or roll under the tire.