During the 12th Five Year Plan period,National High Technology Research and Development Program of China (863 Program),as one of the main drivers of science and technology development,has provided important support for improving China's scientific and technological strength and innovation ability.Acceptance experts play a key role in assessing the level of subject completion and measuring the value of scientific research achievements.The reliability of their scores is directly related to the rationality of 863 program implementation evaluation.Therefore,taking the subject acceptance in a certain field as an example,this paper combines an inverse reinforcement-based model and mathematical statistics methods to systematically analyze the rating bias of technical acceptance experts.Finally,these experts are divided into 8 categories according to their rating performances and corresponding suggestions are given respectively.The results show that the scores are reasonable as a whole,and most experts can give reliable scores;although there are some differences in the rating scales,they are basically in an acceptable range.This study will provide a reference for the review work related to national science and technology plan,and other scientific research management activities,in order to reasonably carry out expert evaluation,refine and standardize review behaviors,improve field expert databases,and select acceptance expert candidates.