The purpose of this study was to investigate the effect of perceived compatibility on perceived awareness with the mediating role of perceived trust (Case study: Bank Mellat West Tehran Branches). The study population of the present study includes all customers of Bank Mellat West Tehran branches They use Bank Mellat. The statistical population According to Cochran's formula, 384 customers of Bank Mellat branches in the west of Tehran who use Bank Mellat will be selected as the sample. Random sampling is simple. This research is an applied research in terms of purpose. This research is descriptive-survey in terms of nature and method. The researcher's purpose in conducting this type of research is objective description. Real and regular are the characteristics of a situation or a subject. The results showed that at the 99.99% confidence level and the 0.01 error level, perceived compatibility with the mediating role of perceived trust has a significant effect on the perceived knowledge of Bank Mellat customers in the west of Tehran. At 99.99% confidence level and 0.01 error level, perceived compatibility has a significant effect on the perceived trust of Bank Mellat customers of West Tehran branches. At 99.99% confidence level and 0.01 error level, perceived trust has a significant effect on the perceived knowledge of Bank Mellat customers in West Tehran branches.