Fan starting control method and apparatus for air-conditioner outside unit

The invention provides a rotary speed and rotary direction determination method for an air-conditioner outside unit before fan starting, a fan starting control method and control apparatus, and the air-conditioner outside unit, wherein the fan starting control method for the air-conditioner outside unit comprises the steps of executing the rotary speed and rotary direction determination method before fan starting until predetermined time is reached; calculating an amplitude value of a comprehensive vector and enabling the amplitude value to be compared with a voltage threshold value at the finishing moment of k sampling period; if a condition that the amplitude values of continuous 10 comprehensive vectors are all greater than the voltage threshold value does not exist, determining to perform a static starting way; and or otherwise, determining the rotary speed and the rotary direction of the fan to further determine the starting way of the fan. According to the technical scheme, by performing detection and o