Abstract: The investigation was carried out on the process of 0. 30mm grain-oriented silicon steel (/% ：0.03 ~ 0.05C、3.0~3.2Si、0.18〜0.24Mn、0.005 ~0.012S、0.006 ~0.011N、0.012 ~0. 024Als、0. 4 ~ 0. 55Cu) produced by low-temperature slab heating technology, in which the inhibitor of Cu₂S + AIN was used and the two-stage cold rolling technology with completing decarburization in the intermediate thickness of cold sheet was used too. It is proved that when the heating temperature is 1220 〜1300℃，the magnetic induction increases as well as the core loss decreases with increasing Als and N in the range of Als (/% ) 0. 01 ~ 0. 022 and N (/% ) 0. 007 ~ 0. 011, and the ratio of qualified products is higher. The second cold rolling rate within 55% -60% (i. e. the thickness after first rolling being 0.65 ~0.70 mm) guarantees the uniform primary grains and proper quantities of Goss crystal nucleus. Temperature, time and thickness affect on decarburation remarkably,while the effect of atmosphere and temperature of water for adding wet is light. In addition, the recovery annealing make for little contribution to improve magnetic properties. The most proper process is heating at 1290 ℃, hot rolling at 1160 °C , finishing temperature at 930 ~ 960 °C , second cold rolling rate within 55% ~ 60% , intermediate decarburization temperature at 840 ~ 850°C , water temperature for adding wet at 65 ℃, annealing atmosphere with 20% H₂ + 80% N₂ , annealing for 8 〜9 minutes based on thickness, and the recovery annealing process can be removed.