The study attempts to trace the development of mosque architecture in Islamic history, in modern architecture in the world, specifically focusing on the history of the mosque in Libya. It investigates whether the conformity of mosque components and finishing is due to historic, current and local Islamic prescriptions / due to functional purposes and necessities, or merely as an imitation of the stereotype styles for loyalty to mental and habitual traditions regardless of functions. The main objective of this thesis is to study &lsquo / the lack of innovation&rsquo / in mosque architecture, especially in the Libyan case. The thesis investigates the factors which may have caused this phenomenon and attempts to explore whether there is possibility to innovate mosque design. For this end, the thesis analyzes and evaluates urban, spatial, architectural and performance properties of the existing mosques in city of Ajdabiya in Libya, the results of which are expected to help architects in developing the innovations in mosque design. Finally, the study asserts that acceptance of innovation is possible under the given circumstances: there are differences from one mosque to another, there are variations of mosque elements in terms of type and form, already varying from region to region. The main reasons for the absence of innovations are found to be due to unqualified designers who lack creativity, fear for the vulnerability of the heritage and some misconceptions and misinterpretations in terms of religious prescriptions.