Loop heat pipe (LHP) is a heat transfer device which mainly relies on t he evaporation and condensation of a working fluid to realize heat transport and uses the working fluid capillary force and vapor pumping force to ensure the fluid circulation.A simple experimental setup was built to test the heat transfer performance of the miniature loop heat pipe.The loop heat pipe is made of stainless steel with co pper mesh wick and secondary distilled water as the working fluid.Heat transfer characteristics of the loop heat pipe under different heating loads, inclination angles are studied experimentally.Results show that the start-u p characteristics and thermal resistance of loop heat pipe are related to the heat load and the inclination an gle.When the heat load increases,the start-up time is short and the thermal resistance is also reduced.But the start -up time and the thermal resistance decrease at first,but then increase,as the inclination angle increases.The LHP also shows good start-up characteristic and can steadily work as well.This provides reference for the pr actical applications of loop heat pipe sink with different installation conditions,and all these indicate that the LHP has the potential to be a good solution for cooling of modern electronics.