From 65438 to 0983, Li Shengbin graduated from the former Medical Department of Shanghai Medical University. He hoped to be an excellent surgeon at that time, but he was wrongly assigned to the forensic major. "Forensic medicine is also a part of medicine." After careful consideration, Li Shengbin accepted the assignment and entered the Department of Forensic Medicine of Xi Medical University. The next year, the school sent him to Sun Yat-sen University of Medical Sciences to study. When he was studying at Sun Yat-sen University, he read an article about DNA technology: Wyman and White published "Highly Polymorphic Loci of Human Beings" in the Journal of the American Academy of Sciences, and he was immediately attracted. Later, when he looked through the data, he found that 1985, the British geneticist jeffries established the technology of "DNA fingerprinting" and successfully applied it to the world's first DNA paternity. These two inadvertently read documents, like a bright light in the dark, pointed out the direction for him. He immediately realized that the original seemingly boring forensic medicine actually contained so many interesting scientific secrets!

In the 1980s, the development of science and technology in China was backward, and there was no related discipline theory of forensic identification, advanced experimental equipment and English literature. For medical researchers at that time, many experiments in books were actually impossible to operate. Nowadays, it is hard for researchers to imagine the embarrassing situation of the scientific community in China at that time, but the poor scientific research conditions did not stop Li Shengbin from advancing. His thirst for knowledge was almost obsessive, he overcame many difficulties and began the arduous course of DNA research. After returning from Sun Yat-sen University, under the guidance of Professor Liu Mingjun, a famous forensic scientist in China, Li Shengbin finished his first paper, Polymorphism of DNA. In this paper, he proposed that the essence of human DNA polymorphism is that the nucleotide sequence in chromosome DNA has changed for various reasons during the evolution, that is, the difference between individual DNA fragments and DNA sequences is lifelong. Theoretically, except identical twins, the genetic markers of 5 billion people all over the world are different, but their blood relatives have the same parts. In this article, he also discussed the research progress, application prospect and urgent need of standardization of DNA. He believes that DNA polymorphism and analysis technology show great vitality in biological evidence identification and will bring great changes to forensic science. This paper opened the prelude of Li Shengbin's forensic DNA research, and showed him another promising village, when he was only 27 years old.