In 2012 packaging represented 40% of the European plastic consumption as only 20% of the wastes of the total production were recycled. To decrease the packaging impact on waste management, an alternative consists in using biodegradable polymers. Among these, Poly(Butylene Succinate) (PBS) is considered as an interesting candidate for replacing polyolefins, mostly used for packaging purposes [1]. It is well-established that drawing conditions in processes such as cast-film or blow-film extrusion- which are the two main processes used to convert polymers into films- can dramatically affect final properties especially mechanical, impact, and optical properties [2]. In this work, we studied the relationships between processing conditions and microstructural features on the development of specific morphologies and packaging related properties of PBS films. Linear PBS blended with different amounts of long-chain branching (LCB) PBS were processed by cast-film extrusion into films at increasing draw ratios. The rheological behavior, the microstructure in terms of degree of crystallinity and overall molecular orientation as well as respective orientation of crystalline and amorphous phases were investigated by differential scanning calorimetry (DSC), birefringence, infrared linear dichroism (IRLD), wide angle X-ray diffraction (WAXD) and scanning electron microscopy (SEM). Finally, the functional properties of tear and puncture of the films were studied. Results show that the presence of LCB does not lead to major modification of the rheological behavior under shear flow while strain hardening is observed under elongational flow. The addition of only 20% of LCB PBS in the blend drastically enhances the overall orientation. SEM micrographs and crystalline phase orientation show that increasing the amount of LCB PBS leads to “row-nucleated-like” type structure. The notched-tear strength of the films was found to be degraded when adding LCB PBS, whereas an enhancement of the puncture resistance is found. [1] M. Garin, L. Tighzert, I. Vroman, S. Marinkovic, B. Estrine, J. Appl. Polym. Sci. 131(2014) 1–7. [2] S. Tabatabaei, P. Carreau, A. Ajji, Polymer. 50 (2009) 3981–3989.