This study, using conditional turbulence method, investigates the factors affecting on instability index in base metals industry sector of Tehran Stock Exchange. For this purpose, monthly data from April 2009 to April 2020 were used. The results show that fluctuations in the industrial sector are caused by factors such as political conflicts and international problems in Iran and are strengthened by fluctuations in parallel markets such as oil, gold and currency. According to the results of the research, factors outside the stock market industry, due to the underdevelopment of the stock market in Iran, have a greater impact than in-company factors on instability of the stock market. From the point of view of the analyzes performed, the most important effect and factor causing fluctuations is the section of political tensions and international relations in Iran, which has uncontrollable effects on parallel markets in Iran and ultimately the effect of all of them is reflected in the stock market.