Purpose: The present study investigated the affective factors which brought technology to adopting Namaye Nashryat software by librarian in public libraries depended on the organization of public libraries of the country in 22 regions of Tehran.Methodology: This survey was an analytical study. The participants consist of 131 librarian and the head of the libraries in public libraries. The census method was used. Questionnaire was utilized for collecting data. The collected data was analyzed using spss16 in both descriptive and analytic statistics. Descriptive statistics consist frequency, percentage and mean, while for analytic statistics Single-Sample T test and Pearson correlation coefficient were applied.Findings: The finding showed technological factors (relative advantage, adoption, easy to use, Trainability and observability) were affective in Namaye Nashryat technology adoption by librarian in public library in Tehran. There was a significant positive and direct relation with adoption. Moreover, the adoption and complexity are recognized respectively as the strongest and the weakest affective factor in technology adoption.Conclusion: Results showed that all technological factors have been affecting the adoption of these technologies. Therefore, it is recommended that in the beginning arrival and deployment of information technologies to libraries, necessary and adequate educations be trained to the librarians, and also library managers and buyers Software libraries when buying and deployment of information technologies, were considered the technology characteristics: relative advantage, complexity (ease of use), adaptation, Trainability and visibility.