الملخص

This paper investigated a modified integral transform method used to solve heat equation in cylindrical coordinate, this modification method has been obtained based on  integral transform (x-coordinate), we expand  integral transform (x-coordinate) to  integral transform (x,y,z,t-coordiantes) and convert it to cylindrical coordinate denoted by  integral transform (r,θ,z,t-coordinates). Finally we used  integral transform to solve heat equation in cylindrical coordinate.