Abstract: The accuracy of the nuclear cross section data is a prerequisite for the accuracy of reactor physics calculations.The code RXSP（Reactor Cross Section Processing Code） is developed by REAL（Reactor Engineering Analysis Laboratory） of Department of Engineering Physics in Tsinghua University.The key methods such as fast Doppler broadening,thermal libraries interpolation,and OpenMP parallel acceleration,have been achieved within RXSP.This code is able to process the original data of ENDF/B（Evaluated Nuclear Data File/B） efficiently and accurately to produce the continuous energy point cross section data which is used for RMC.By comparing with NJOY,the microscopic and integral verifications show that RXSP has the same accuracy as NJOY while RXSP has much less processing time to meet the demand in the reactor physics-thermal-hydraulic coupling calculations requiring the frequent updates of a large number of materials and temperature points.In addition,RXSP make it available to process the resonance parameters of the R-matrix Limited format.