Abstract : Research purposes ： The partial coefficient is one of tlie target values in the transition to the limit state design of China s reliability design standard (code). Currently， the theoretical calculation formula of the partial coefficients recommended by all kinds of reliability design standard ( code) cannot meet the needs of practical problems. Therefore， it is very necessary and important to establish a reasonable calculation method of the partial coefficient for the perfection or the supplementation of standard ( code) in the days to come. Research conclusions:(1) Based on the theory of variable correlation，a new partial coefficient calculation formula is built. (2) A characteristic that tlie partial coefficients corresj^onding to lad and resistance are positive or negative at tlie same time is analyzed. (3 ) The effect of correlation on the partial coefficient was analyzed by numerical examples. This results show that tiie partial coefficients to load term and the resistance term are changed witii a ratio equal to the safety factor which indicates that partial coefficient considering the correlation can meet the reliability design cde of railway engineering in our country based on the requirement of safety coefficient design met!iod for transition. (4) The research can provide the theoretical basis and method support for the design code transition in railway engineering from the safety factor method to the partial coefficient method.