As a result of research exploration patronage appointments to the experts from the International Court institutes Mongolian investigators and the court, responsible for the prosecution of all subjects are interrelated trial research organizations on what industry experts dispute appointment, without question important to them in the case, We are hoping that we will improve awareness of the trial research group. This case will be much easier to defend the interests of participants in the dispute as a possible peace party funds to resolve the case easy to save money and time. Administrative regulations of the Criminal Procedure Code, Civil Procedure Code, Trial expert law has no regulation of expert safety circumstance, but regulated the case participants, and the integrity of the trial exploration object and rights. Moreover, it regulates about that expert must explore inton of criminal case. And there is problem that anyone can threat the experts because of lack of regulation about it. Therefore, Trial experts must provide bythe legal framework ensure in order to protect them from any pressure and subjectively impact.