Third Line Construction is a great exploration of independent and self-reliant layout of China''s national defense and basic industrial construction, and has made important historical contributions to the creation and development of the path of socialism with Chinese characteristics. Third Line Construction has consolidated national defense, improved combat readiness, and provided a security prerequisite for the opening up of reform and opening up. Third Line Construction has improved the uneven layout of China''s industrial economy in the east and west, facilitated the development of the western region, and laid a solid foundation for the creation and development of socialism with Chinese characteristics from a material perspective. Third Line Construction forges the Third Line Spirit, which is a beneficial nutrient in the cultivation of socialist culture with Chinese characteristics. The great achievements in Third Line Construction fully demonstrate the correct leadership of the CPC, the advantages of socialist public ownership and the system of nationwide mobilization of resources, and have reinforced people''s confidence and belief in the socialist system and the path of socialism with Chinese characteristics.