Isfahan, one of the Iranian historical cities in Islamic era, experienced a flourish in architecture as a result of its special situation particularly during Safavid dynasty ruling. The city was provided with many mosques, palaces, bridges, streets and gardens alter it was declared as capital by Shah Abbass and its development continued through Shah Abbass (the second) ruling as well. The golden age of Safavid architecture coincided with the coming of Shah Abbass I to throne. Although it hardly can be regarded as the brightest age of architecture in Iran; it was an improvement period in Iranian architecture. Unlike the primitive periods of architecture, color and decoration played a great role in Safavid architecture. Many buildings remained of this era, are very beautiful and rare in terms of decoration and external form, although they are not so interesting in terms of architectural principles. Therefore, Isfahan buildings in that time can be considered an important source of study about decorational elements in Iranian-Islamic architecture. Beautiful places like Aliqapu, Hasht- Beheshtand Chehel-Sotun and also famous mosques like Imam and Sheikh-Lotf-Allah represent the glory of Safavid decorational architecture. Armenians, One of those groups who had been made to immigrate to Isfahan by Shah Abbass (the first). needed their cultural essentials to provide their moral and material life in Safavid Capital. So, their need of worship places, made them to get the permission of Safavid court, to build churches. Among churches Of Safavid era, Van, Beit -Lahm, Saint Maria, Saint Peter ..., et can be mentioned artists decorating these churches, influenced by Safavid architectural styles and they even used Islamic architectural decorations to decorate churches. In present essay, the impression of Safavid architectural decorations on the decoration of these buildings has explored. So the main aims of the essay are as follow:I. To identify architectural characteristics of Armenianchurches in Isfahan besides Islamic architecture of Safavid era:To study the nature and amount of Safavid architectural effectson Isfahan churches decoration. Also these questions are answered:2.How Safavid Islamic architecture has influenced the decorationsof Armenian churches in Isfahan?3. On which one of Safavid buildings or Churches of Isfahan such influences can be evident?4. On which parts of churches the styles of Safavid decorative elements can be better evident?The essay materials have been compiled from historical literature, documents, pictures and photos available. Arranging andediting has also been done through descriptive,analytical and comparative method.