The uniformity principle of Temperature Difference Field（TDF） was studied in multi-pressure condenser when heattransfer coefficient was considered as variable. The heat transfer coefficient is a relevant constant in different steps of con- denser. The relation obtained is the same as the research results of reference 1 in which heat transfer coefficient was re- garded as a constant. In order to verify the correctness of deduction

the study conducted in multipressure condenser withother two methods and the conclusion coincides well with the results of uniformity analysis of TDF.