The disclosure provides a delay statistical method and apparatus thereof. In the delay statistical method, a first packet and a second packet that belong to a measurement period are obtained, where the first packet includes a first in-situ flow information measurement (iFIT) header with first flow detection information, and the second packet includes a second iFIT header with second flow detection information; a first delay parameter is obtained based on the first flow detection information and sent to a statistical apparatus; and a second delay parameter is obtained based on the second flow detection information and sent.