First, seeking truth from facts, as the fundamental principle of Marxist scientific world outlook, embodies the organic unity of materialism, dialectics and epistemology, and is also the fundamental principle of thorough materialism and dialectics and dynamic revolutionary reflection theory.

Second, seeking truth from facts, as the fundamental principle of Marxist scientific world outlook, embodies the organic unity of world outlook and methodology, and is also the fundamental methodological principle.

Thirdly, seeking truth from facts, as the fundamental principle of Marxist scientific world outlook, is also the fundamental requirement of scientific practice view and the fundamental principle that all practical activities must follow.

As the party's ideological line, seeking truth from facts has very rich contents, mainly including three aspects: proceeding from reality, integrating theory with practice, and persisting in practice are the criteria for testing truth.

2. The significance of emancipating the mind and seeking truth from facts

Deng Xiaoping not only made outstanding contributions in the process of re-establishing the Party's ideological line, but also developed the Party's ideological line.

First, the party's ideological line is summarized as "emancipating the mind and seeking truth from facts" for the first time. This is more complete, more rigorous, more accurate and more characteristic of the times than the word "seeking truth from facts".

Secondly, the essence of emancipating the mind and seeking truth from facts and its decisive role in practice are expounded theoretically.

Third, the party's ideological line has been fully expressed.

The fourth is to clarify the relationship between the party's ideological line, political line and organizational line. Ideological line is the basis of political line and organizational line. Whether the correct political line can be implemented depends on whether the ideological line is correct.