The process design and industrial trial production are carried out based on the technical requirements of 880 MPa, 930 MPa and 980 MPa packaging steel strip as well as the technological processes of conventional 2 250 mm hot continuous rolling production line and 2 030 mm production line with pickling line tandem cold rolling mill in Inner Mongolia Baotou Steel Rare Earth Steel Plate Co., Ltd. and blue annealing production line of customer. The test steel with such composition combination as medium carbon, low silicon and manganese is smelted with such technologies as KR desulfuration and calcium treatment. The mechanical properties of hot rolling, pickling and blue annealing for test steel are analyzed as well as the trial production process satisfying different strength levels of packaging steel is determined. It is found that the pearlite is basically eliminated and the microstructure of ferrite and bainite is formed with the coiling temperature of 500 ℃ so that the strength and elongation of finished product could be improved by comparing the microstructure and properties of hot rolling and performances of steel strip with blue annealing of 600 ℃ and 500 ℃ coiling temperatures. 3 strength levels of packaging steel are successfully developed through trial productions so that the production process is trouble-free as well as the stable production and batch applications are realized.