To deal with the elastic intercity travel demand of the passenger,the optimization of the compined decision-making involving the bus operating frequency and the ticket price of the passenger transport enterprise was studied.

This paper presents a mathematical depicture of the relationships between bus frequency,signal cycle,and number of arrival-time-point.

An optimized model for public transportation lines departure frequency was established with the goal of passengers\' satisfaction.

The operating frequency of variable frequency adjustable speed motor is variable, and the traditional electromagnetic calculation of induction motor is done at rated frequency, so the traditional calculation program is not suitable for the calculation of motor under the conditions of low frequency and high frequency.