Barium chlorate can be made by reacting sodium chlorate and barium chloride. It can also be made by electrolytic oxidation of barium chloride, similar to the chloralkali process. It can also be made by reacting ammonium chlorate, an unstable compound, with barium carbonate. This mixture is boiled, converting the ammonium carbonate to ammonia and carbon dioxide.
Barium chlorate is used in fireworks to make a green color. It is also used in matches to make oxygen and make the match burn faster.