Abstract: In order to improve anti-corrosion and lubricity performances of the traditional high-water content hydraulic fluid , this paper adopted refined base oil, high-effective surfactants, anti-rust agent,developed a new microemulsion of hydraulic support with high stability, excellent cleanliness. The main performance indexes of the microemulsion meet the requirements of MT76-2011, and its diluent was homogeneous and transparent liquid. Applied in hydraulic support system of Talahao coal mine 2102 workface, results showed that the new microemulsion with excellent stability, rust resistance, compatibility and lubrication, no odor, bacteria ,irritation and other undesirable phenomena, can fully guarantee smooth operation of the support system.