In southern coastal areas of Iran, establishing rock-made breakwaters is more prevalent than other kinds. Exploitation of local facilities and availability of appropriate materials is of great importance in establishing rock-made breakwaters. Also, keeping these materials needs to be cheap and must guarantee the safety and required preserve during their lifetime. Furthermore, with regards to poverty in coastal areas of the country, making use of Loamashell rocks as cheap sources in creating breakwaters is of great importance. However, loamashell rocks are often considered to be unsophisticated since they have weak physical and mechanical characteristics and are often used in outer layers of breakwaters. In addition, concerning economic parameters, traortation of these rocks from far places are not often financially reasonable. Therefore, with regards to the mentioned shortcomings, optimizing the preserve and lifetime of Loamashell rocks, if economical, can make some of these rocks ready for being used. In the present study, in a field study, sampling was made from rocks Holor Mine in Dargahan located in northern east of Qeshm Island, Iran. Samples were categorized into four categories: the first were strengthened by limewater, next were strengthened by Epoxy resin, other group by biological grout. The last category were treated as the controlled group so that other strengthening materials would be compared against each other. Then, working out engineering experiments for the preserve evaluation of samples, characteristics of these materials including physical, preserving, and strength, and mechanical characteristics were defined. Findings indicate that limewater, because of containing great amounts of water, cause a decay in rocks and decreases mechanical characteristics of rocks to 8.5% degree in comparison to its first condition. Strengthening by the biological grout led to water content in rocks and increased their quality to 7% degree. Epoxy resin was shown to be better than the other two strengthening materials and optimized rocks quality to a 17% degree. Nevertheless, it is considered as a surface strengthening material because of different physical and chemical characteristics with rocks and shallow depth and it has to change periodically on the surface of rocks.