Since February 26, 2013 discovered the bodies of victims. The Supreme Court reversed the case back to the High Court. When the public will focus on whether the accused is sentenced to death, police officers should carefully review the investigation process of the case. Fromthevictims' body was found, and the later investigation process, review the investigation tactics, techniques and procedures. And apply for "rationalization", "scientific method", systematization "Regularization" to criminal investigation of engineering knowledge.