The unique feature is that "Du Seiko" is used to effectively and stably reduce the release of free formaldehyde from the fiberboard used for E2 floor substrate by adopting the vacuum box intermittent low-concentration ammonia fumigation method according to the reaction mechanism between ammonia and formaldehyde; Through hot pressing and curing, the residual ammonia in the substrate was eliminated. The floor with brand-new E0 technology has achieved the environmental protection performance with formaldehyde content of 0. 1-0.3 mg/L, which is better than the current national standard E0 level ≤ 0.5 mg/L; The new E0 environmental protection floor is a good floor that is environmentally friendly from the core to the surface. Both the substrate and the floor meet the national standards, and the final test results show that the formaldehyde emission is far lower than the national standards. Healthier, more environmentally friendly, so that home decoration has no worries.