One of the most important issues on quality of building structure is its resistance against
earthquake. Earthquake, as one of natural disasters, has been one of the main reasons of fatal
incidents in developing countries. Any attempt to increase the quality of building structure
could reduce any possible damages an earthquake could cause on society. This paper presents a
system dynamic model to study the importance and behavior of the factors which affect the
construction quality of buildings & apos; structures. The proposed model of this paper is analyzed for a
case study and the results are discussed. The paper also uses DEMATEL technique to compare
the results of the proposed method. The paper concludes that among the whole factors which
affect the construction quality of buildings & apos; structures, the "performance of related
organizations and institutions" is of the most important ones.