Electronic Journal of Differential Equations, Vol. 2008(2008), No. 12, pp. 1-11. Title: Existence of positive solutions for semi-positone systems Authors: Abdou K. Drame (Univ. of Nevada, Las Vegas, NV, USA) David G. Costa (Univ. of Nevada, Las Vegas, NV, USA) Abstract: This paper studies semi-positone systems of equations by using phase plane analysis and fixed point theory. Submitted July 18, 2007. Published January 24, 2008. Math Subject Classifications: 34B18, 47H10. Key Words: Positive solution; semi-positone system; phase plane analysis; Schauder fixed point theorem.