With the expansion of regional and trans-regional powers competitiveness, the Caspian Basin has become a stressful and unstable environment and as a result, the coast guard structure of the regional countries has developed significantly. The present study examined factors such as manpower, buoyancy equipment, force training, structure, geopolitical factors, and military capability in the target countries. This study is applied in terms of purpose. The research data were collected by documentary method. The study population consists of all documents, reports and articles in scientific databases written about the Islamic Republic of Iran and Russian Coast Guard, Azerbaijan and Turkmenistan. In order to analyze the data, the comparison tables of marine characteristics, differences and similarities between the Islamic Republic of Iran and the Russian Coast Guard, Turkmenistan and Azerbaijan were used. The results of the study show that Russia has the best coast guard in comparison with the other three countries and can be a good model for the Islamic Republic of Iran in order to enhance maritime control and improve the control and monitoring of maritime borders.