An embodiment of the invention discloses a control method of a combined heat and power generation unit for cooperative steam extraction of a cold section and a hot section of a reheater. The combinedheat and power generation unit comprises a first
heat supply steam header, a second
heat supply steam header, the boiler reheater, a high-pressure cylinder, an intermediate-pressure cylinder, a
data acquisition and control device, a thrust pad lubricating oil
system, a pipeline, a measuring device and a valve. The
data acquisition and control device (57) is observed to enable the steam extractionflow of the cold section of the boiler reheater to be basically close to the steam extraction flow of the hot section of the boiler reheater, and meanwhile whether parameters such as
axial displacement, first shaft vibration, second shaft vibration, first bearing bush cover vibration, second bearing bush cover vibration, thrust pad temperature and reheater
pipe wall
metal temperature are within asafety range value or not is observed. According to the control method, online monitoring and adjusting of
unit operation parameters are achieved, the effects of
temperature control and vibration reduction are achieved, the service life of equipment is prolonged, the steam extraction and
heat supply flexibility of the unit is improved, and full utilization of energy is achieved.