Benzaldehyde, also known as benzoin aldehyde, is an organic compound formed after the hydrogen of benzene is replaced by aldehyde group. Benzaldehyde is the simplest and most commonly used aromatic aldehyde in industry. At room temperature, it is a colorless liquid with special almond smell. Benzaldehyde is a compound formed by the direct connection of aldehyde group and phenyl group. It was once called bitter almond oil because of its flavor similar to bitter almond. Benzaldehyde widely exists in the plant kingdom, especially in Rosaceae plants. It mainly exists in the form of glycosides in the stem bark, leaves or seeds of plants, such as amygdalin in almond, cherry, laurel leaves and peach kernel. Benzaldehyde naturally exists in almond oil, agastache oil, hyacinth oil, Ylang Ylang Ylang oil and other essential oils. Benzaldehyde is an important raw material for medicine, dyestuff, perfume and resin industry. It can also be used as solvent, plasticizer and low temperature lubricant. In the flavor industry, it is mainly used for the deployment of food flavors. It is used in flavoring and tobacco flavors. Although widely used as commercial food condiments and industrial solvents, benzyl alcohol is mainly used in the synthesis of a variety of other compounds ranging from pharmaceuticals to plastic additives. Benzyl alcohol is also an important intermediate product in the production of perfume, perfume and synthetic aniline dyes.