Features of major leading technology: 1) The design technology structure for reducing the heat absorption of the drying tunnel equipment 2) The design technology of maximally reducing the heat escape 3) High-tech fuel and gas drying tunnel equipment, appraised by the provincial department of science and technology, with conclusion that the heat efficiency above ≥85%. Compared with the international level, it can substitute the imported products, and can reduce heat loss by 5-10% than the conventional design 4) The different components of electrical heating drying tunnel can lower 4kW/m3 than the conventional design, and save electricity by 0.8kW/m3, 1.2kW/m3 and 0.5kW/m3 respectively