In order to safeguard the leadership of the Party’s United Front Alliance, Lenin once put forward the ideas of purifying the thought of the United Front Alliance by Marxism, guarding against imperialist who wanted to disintegrate the United Front Alliance and expand the United Front Alliance by utilizing its contradictions，and insisting on people-oriented and effectively meeting the multidimensional needs of the people to strengthen the United Front Alliance. It not only strengthened the United Front Alliance of Russian Revolution and Construction, but also provided important enlightenment for the Communist Party of China to lead the United Front, from the perspectives of defending the leading position of Marxism, resisting the reactionary forces of the West and strengthening the people’s co-construction and sharing, and so on.