Science and Education Publishing American Journal of Numerical Analysis 2372-2126 4 1 2016 4 28 New Constraction Seven Degree Spline Function to Solve Sencond Order Initial Value Problem 11 20 EN Karwan H.F. Jwamer Mathematics Department, School of Science, University of Sulaimani, Sulaimani, Kurdistan Region, Iraq Najim Abdullah I. AJNA2016413 10.12691/ajna-4-1-3 2015 12 14 2016 4 3 2016 4 26 Our paper dedicated to find approximate solution of second order initial value problem by seven degree lacunary spline function of type (0, 1, 6). The convergence analysis of given method has studied. Numerical illustrations have given with example for calculating absolute error between spline functions and exact solution of second order initial value problem with their derivatives.