The fractional integral and differential equation with nonlinear delay is studied with Jacobi spectralcollocation method. After proper linear transformation

an approximate solution and an approximate derivative of the solution are obtained by Gauss quadrature formula. By Jacobi collocation discretization

a rigorous error analysis is provided to show that the error of the approximate solution and the error of the approximate derivative both decay exponentially in the infinity norm and the weighted L

2

-norm.