Compression nebulizer is much better than ultrasonic nebulizer, because ultrasonic nebulizer will disperse the nebulized drug into relatively large particles, which is not conducive to the drug into the respiratory tract, the drug is easy to deposit in the mouth for the efficacy of respiratory system diseases is far from enough. Compression nebulizer will disperse the drug into especially small particles, these ultra-fine particles will not collide and combine, especially easy to enter the lower respiratory tract, will not be deposited in the mouth, for lung and bronchial diseases will be more effective. Compressed nebulizer does not need to dilute the drug when nebulized, can achieve effective drug concentration, the clinical efficacy will be better, will not produce drug residues, the utilization rate of drugs is also relatively high, the size of the nebulized volume produced by the compressed nebulizer is more appropriate; ultrasonic nebulizer is not.