Proteases play an important role in fungal physiology and growth and in infection of pathogenic fungi as well. Fungal proteases may be involved in adhesion, colonization, spreading and escaping from the host immune response. Some proteases are considered as allergens, which can induce asthma and allergic diseases. Knowledge of the pathogenesis of the proteases will increase our understanding about the action of each fungal protease and will help to provide clues for the diagnosis and treatment of fungal infection.