Abstarct: Application of surface treatments is one of the practical preventing methods for improving pavement serviceability. One of the most efficient protective surface treatments is microsurfacing. Microsurfacing consists of the application of a mixture of water, asphalt emulsion, aggregate (very small crushed rock), and chemical additives to an existing sound asphalt concrete pavement surface. It is applied in a thin laxyer to remedy many road surface deteriorations in a short period of time. The use of emulsified asphalt microsurfacing is convenient and preferable over the other pavement maintenance approaches as they provide all the desirable properties of many maintenance techniques without creating any environmental problems. The major concern is how to improve the performance of microsurfacing mixes to suit local traffic and environmental conditions. In Iran, annually, large amounts of Iron slag aggregates are produced as a waste material that have the superior and desirable qualities to be used in the road pavement industry. In this study, first, the potential problems and the factors affecting the performance of the microsurfacing are identified. Then, the possibility of using Iron slags along with limestone aggregates in the mix design to improve the mix performance was investigated. Moreover, in the mixing design, 2% cement and 3% SBR latex were used in the mix design to modify and improve the performance of the mixture. The performance tests proposed by the ISSA standard, including cone consistency test, Adhesion test, Wet Track Abrasion Test and Load Wheel Test (LWT), were performed to evaluate the mixtures performance. The results showed that the use of Iron slag, Portland cement and latex in the mix design can improve the performance of the mixture noticeably. In fact, modification of bitumen emulsion with latex compared to a non-latex mixture, improved abrasion resistance performance by approximately 40 to 81% and the performance of the mixture in the LWT by 10 to 45%. Also, the addition of cement improved the performance of the mixture in the loading test by roughly 4 to 20% and a maximum weight loss of 34% in the WTAT.