Cheyletus eruditus (Schrank) has broad application prospects of controlling the stored grain insect pests (SGIP). Developmental duration, developmental threshold temperatur and effective accumulated temperature of C.eruditus were researched at 16, 20, 24 and 28℃ and relative humidity of 57%, 75% and 93% in laboratory. The results showed that it had five stages, including egg, larvae, protonymph, deutonymph and female adult. Development durations of all stages were all negatively correlated with temperature, and their shortest developmental duration of different stages was 3.4,4.4,4.1,3.9, 15 days, respectively. At 28℃, relative humidity 75%, the whole developmental duration was the shortest of 30.8 days, and at 16℃, relative humidity 75%, the development lasted 118.6 days, which was the longest in this study. At relative humidity 75%, almost all the stages of C. eruditus had the shortest developmental duration. There was significant logistics regression between developmental duration and temperature. Based on the direct optimum method, the developmental threshold temperatures of a generation and total developmental duration were 10.39℃ and 11.64℃ respectively, and the effective accumulated temperatures were 367.09 and 543.72 day-degrees. All these results provided a basis for rearing C.eruditus on large scale in factory and the application.