The need of energy source in Indonesia is increasing as the population, economy and energy consumption rapidly grow. The fossil energy source is running out while the number of people in the world is always increasing. For the need, one of the alternative energies that can be used as renewable energy is vegetable oil. Vegetable oil can be used as alternative fuel that can be renewed and is environmentally friendly compared to fossil fuel. However, vegetable oil has some weaknesses, such as having high viscosity and low calorific value. So, it needs an effort to improve the characteristics. One of them is by oil mixing with heating. The raw materials of vegetable oil that are potential as fuel are among others palm and corn oil. The research on the mixing of palm and corn oil was conducted by mixing composition variation. The composition ratios of mixing variation done are 100:0, 90:10, 80:20, 70:30, 60:40, 50:50, 40:60, 30:70, 20:80, 10:90, and 0:100 (%) with the duration of 80o Celsius mixing temperature. Based on the test result of palm and corn oil mixing, more corn oil mixing composition on palm oil can influence the physical characteristic. The more the composition variation of corn oil mix on palm oil, the higher the density value is. Meanwhile, the viscosity, flash point, and calorific value were decreasing.