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The placenta, as a large discarded tissue and rich in extracellular matrix (ECM), is an excellent candidate for biological scaffolds in reconstructive medicine. Considering the importance of ECM structure in cell fate, the aim of this study was to achieve human placenta decellularization protocol that preserve the structure of scaffolds. Thus, human placenta was decellularized by four protocols and decellularization efficacy was compared by hematoxylin and eosin (H&E), 4',6-diamidino-2-phenylindole (DAPI) staining, and DNA measurement. Decellularized placenta structure preservation was assessed by Masson's trichrome staining, scanning electron microscopy (SEM), and immunofluorescence (IF) for collagen I, IV, and fibronectin. Finally, liquid displacement measured scaffolds' porosity. After culturing menstrual blood-derived stem cells (MenSCs) on placenta scaffolds, cell adhesion was investigated by SEM imaging, and cell viability and proliferation were assessed by MTT assay. According to H&E and DAPI staining, only protocols 1 and 3 could completely remove cells from the scaffolds. DNA measurements confirmed a significant reduction in the genetic material of decellularized scaffolds compared to native placenta. According to Masson's trichrome, IF, and SEM imaging, scaffold structure is better preserved in P3 than P1 protocol. Liquid displacement showed higher porosity of P3 scaffold than P1. SEM imaging confirmed cells adhesion to the decellularized placenta, and the attached cells showed good viability and maintained their proliferative capacity, indicating the suitability of the scaffolds for cell growth. Results introduced an optimized protocol for placenta decellularization that preserves the scaffold structure and supports cell adhesion and proliferation., (© 2022 International Center for Artificial Organ and Transplantation (ICAOT) and Wiley Periodicals LLC.)