Lobar pneumonia and lobar pneumonia are classified according to etiology and anatomy, the main differences are: 1, age of onset: lobar pneumonia often occurs in young adults, lobar pneumonia is more common in children and the elderly; 2, fast and slow onset: lobar pneumonia starts very quickly, lobar pneumonia is relatively slow; 3, the severity of symptoms: lobar pneumonia symptoms are more severe, high fever retention. Small lobar pneumonia is mainly flaccid fever; 4. causative organisms: large lobar pneumonia causative organisms are mainly Streptococcus pneumoniae, small lobar pneumonia is a variety of bacteria; 5. site of onset: large lobar pneumonia begins with alveolar lesions and rapidly accumulates to the entire lung segment or lobe, small lobar pneumonia is centered on the fine bronchi, scattered distribution; 6. complications: large lobar pneumonia has fewer complications, small lobar pneumonia, more complications.