The charging standard for trans provincial patient transfer of Kunming ambulance is 600 yuan to 1000 yuan for short distance transportation of trans provincial patients, and 7 yuan to 10 yuan per kilometer for long-distance transportation. General expenses shall be deducted according to the critical illness medical records and general expenses. Critical patients are generally equipped with invasive ventilators. The supply of ordinary types of O2 is simple, and the transport of critical patients in large cities is too little.