In normal cases, the ventilation for multiple tunneling faces is difficult. In the paper, comparison and contrast is made on jet flow gallery ventilation mode, main fan ventilation mode and forced ventilation mode in terms of technology and economical efficiency, with the ventilation for the entrance section of Sandu tunnel as an example. The economic rationality of the ventilation mode adopted is analyzed, the energysaving principle and energysaving effect of the automaticcontrolled frequencyconversion of the ventilation fans are analyzed theoretically. The ventilation practice demonstrates that the energysaving target has been achieved. 