To use the renewable fuels for marine field is still very limited due to the need of newly developed technology, highly requested safety (for gas fuel) and high price of biodiesel. Therefore, with some advantages, such as: simple producing process, reasonable price and simple modification technology needed, the blended SVO (straight vegetable oil) is recommended as suitable fuel for the marine application. Even though, there are some disadvantages of the blended SVO, such as a weak stability, layer separation in low temperature and some others. In order to apply the blended SVO as alternative fuel for marine diesel engines without the mentioned disadvantages, the paper will introduce a method to design and produce a fuel continuous mixer to make a blended SVO (palm oil).