University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 25 4 2014 12 01 Subpullbacks and Po-flatness Properties of S-posets 369 377 52624 EN A. Golchin Department of Mathematics, Faculty of Sciences,University of Sistan and Baluchestan, Zahedan, Islamic Republic of Iran L. Nouri Department of Mathematics, Faculty of Sciences,University of Sistan and Baluchestan, Zahedan, Islamic Republic of Iran Journal Article 2014 04 16 In (Golchin A. and Rezaei P., Subpullbacks and flatness properties of S-posets. <em>Comm. Algebra</em>. 37: 1995-2007 (2009)) study was initiated of flatness properties of right -posets  over a pomonoid  that can be described by surjectivity of  corresponding to certain (sub)pullback diagrams and new properties such as  and  were discovered. In this article first of all we describe po-flatness properties of -posets over pomonoids by po-surjectivity of  corresponding to certain subpullback diagrams. Then we introduce three new Conditions ,  and  and investigate the relation between them and Conditions , , , ,  and . Also we describe these properties by po-surjectivity of  corresponding to certain subpullback diag In (Golchin A. and Rezaei P., Subpullbacks and flatness properties of S-posets. <em>Comm. Algebra</em>. 37: 1995-2007 (2009)) study was initiated of flatness properties of right -posets  over a pomonoid  that can be described by surjectivity of  corresponding to certain (sub)pullback diagrams and new properties such as  and  were discovered. In this article first of all we describe po-flatness properties of -posets over pomonoids by po-surjectivity of  corresponding to certain subpullback diagrams. Then we introduce three new Conditions ,  and  and investigate the relation between them and Conditions , , , ,  and . Also we describe these properties by po-surjectivity of  corresponding to certain subpullback diagrams and describe Conditions ,  and  by weak po-surjectivity of  corresponding to certain subpullback diagrams. rams and describe Conditions ,  and  by weak po-surjectivity of  corresponding to certain subpullback diagrams. https://jsciences.ut.ac.ir/article_52624_005e19873f79d5dcd9e51222cd5fc670.pdf