OBJECTIVE： To study the public-trust influential factors of institutes for food and drug control （IFDC） and establish public-trust evaluation index system so as to provide reference for public-trust construction and maintenance. METHODS： Through literature research and analysis， key public-trust influential factors of IFDC were extracted to set up three-level evaluation index system. The weight coefficient was set up by questionnaires and processed with standardization data processing to establish quantitative evaluation model. RESULTS & CONCLUSIONS： The three-level evaluation index system and evaluation model had been built， including political factors， detection capability， service quality， information disclosure， and supervision and regulation； there were 5 first-level index， 15 second-level index and 33 third-level index. The weight coefficient of 5 first-level index were 0.146 7， 0.320 0， 0.183 3， 0.233 3 and 0.166 7， respectively. According to the weight of different index， a recommendation to improve the public-trust of the provincial IFDC is that changing its short-board to achieve this goal. Firstly， they should focus on improving the detection ability； secondly， they should do a good job in information disclosure； thirdly， they should improve the quality of service continuously and strengthen the internal and external supervision.