Abstract: Currently, Microwaves are widely used in chemical Industry to accelerate chemical reaction. Some research result has shown that microwaves heating can significantly accelerate the reaction. The purpose of this experiment was to synthesize of dibutyl pthalic by using butyl alcohol, pthalic anhydride and catalyst as a sulfamic acid under the microwave oven. Kinetic study of above system was carried out it is found that reaction is very fast under microwave oven. Use of microwave energy to heat chemical reaction leads to not only reduce the chemical reaction from hour to minute also reducing side reactions and increases the yeid and improve the reproducibility.