With the popularization of cement enterprises to build ultra-low nox emission projects(mainly for SCR denitrification technology path),the production managers of cement enterprises are more and more concerned about the increased resistance brought by the construction of SCR system to the original production line.How to optimize the design and the best match of system integration technology will be the focus of the majority of environmental science and technology workers to solve.This paper briefly introduces that when constructing SCR project,scientific setting of pressure measuring points is very meaningful for the accuracy of system pressure differential data,especially for the accuracy of SCR reactor pressure differential data and the accurate scheduling of production management.