Abstract The required factors have been investigated to apply knowledge management by carrying out the field study using staff opinions of Kermanshah Telecommunication Company in this research. After indicating the required factors of applying knowledge management, relationship between each factor of knowledge process system, organizational culture and information technology system with the knowledge management have been analyzed statistically by the obtained results using SPSS program. Kermanshah Telecommunication Company has a population of 370 staff that a sample of 77 staff has been used. It has been found that there are acceptable correlation between knowledge process system, organizational culture and information technology system with the knowledge management which correlation coefficient (R) of each relationship is 0.854, 0.915 and 0.812 respectively. There are some different between the effects of knowledge process system, organizational culture and information technology system on the applying knowledge management as the effects knowledge process system, information technology system and organizational culture are in the fist, second and third step respectively.