The core creed of modern public-private relations established by Avery in the Declaration of Principles is that "whatever is beneficial to public utilities will ultimately be beneficial to enterprises or organizations". His slogan is "The public must know". It can be seen that the core of Ai Weili's public relations thought is "telling the truth" and "telling the truth".

Li Jinmei was born in a pastor's family in Georgia, USA. Graduated from Princeton University and engaged in journalism in his early years. He has worked as a reporter for The New York Journal, The New York Times and new york World. 1906 in view of the limitations of barnum's publicity activities, Avery Lee put forward the working creed of "telling the truth". He published a famous declaration of principles through newspapers and magazines.