Abstract: Feedforward symbol timing estimating algorithm is usually used for burst signal. Performance of non-data aided algorithm is seriously deteriorated when signal is shaped with small rolloff parameter or at low signal-noise ratio entironment. A new feedforward data-aided timing estimationing algorithm is proposed in this paper to solve this problem. Accurate timing estimation is made here by interpolation to the correlations which has been calculated at acquisition process already. The algorithm requires only two sampling points per symbol and can be realized much simple. But simulations suggest it results in perfect performance. MSE of it closely approachs the modified Cramer-Rao bound (MCRB) even at very low signal-noise ratio or with little rolloff parameter. Structures of the algorithm are also provided here for two different types of applications.