The basic mechanical properties of polypropylene FIBC base material were tested by tension experiment, the reason of differences in mechanical properties of main base material between expectant value and experimental value was analyzed. And the advertent issues were obtained during FIBC production and designing as follow: by controlling the strength of ribbon-like filament to ensure that the tension received during beam-warping is well-distributed in order to improve the strength efficiency; the fabric materials with same strength should be selected for longitude and woof fabric of bag body; optimizing the sewing method for connection parts to make them breaking at the same time with fabric of bag body in order to avoid material wasting.