Friction welding is a solid state welding method applied to the cylindrical metal joining of different type. Heat welding is friction of tow metals will be welded. By combining heat and pressure forging so, to metals will connect. In the connection process, it uses some important parameters which affect result of the strength of its joining. One of parameter that is very effect for welding result of joining is friction pressure parameter. The aim of the research is find out the effect of friction pressure to temperature distribution result, micro structure and hardness of joining result. The materials used in this research is aluminium 6061-T6 and stainless steel 304. Each specimen was cut to 75 mm long, and machined to produce specimen standard JIS using a lathe. The welding process uses a variation of friction pressure 30 MPa, 35 MPa, and 40 MPa. Other parameters are are constant 2 seconds friction time, upset pressure 50 MPa, upset time 2 seconds, and engine speed is 1000 Rpm. To know the effect of friction pressure to joining on the result by doing observation of temperature distribution, micro structure and testing of vicker micro hardness. On the temperature distribution result show that the greater the friction pressure used the temperature distribution result which is obtained will be higher. On micro structure testing the result of the joining has changed the micro structure in the area aluminium 6061-T6, while the area stainless stees 304 the micro structure did not changed and still the some as the base metal. On hardness testing in aluminium section increased the hardness of as the friction pressure is applied. While on the stainlees steel 304 the result are assumed to the be equal to base metal.