In this paper the effort can be made for experimental investigation on the copper heat pipe. The copper heat pipe is efficient for achieving the maximum heat transfer. The copper heat pipe of suitable dimension is taken into the consideration, in which the working fluid like iron oxide mixed with DI water is used. The performance of copper heat pipe is tested and compared with different two working fluid; also the heat pipe is tested with different filling ratios. Overall the approached is made for improving the performance of heat pipe.