Abstract: We propose an improved generalized adaptive coherent integrator (IGACI) using coefficient ad-justment. In this algorithm,the coefficients are changed with SNR. It can be used to detect linear freque-ncy modulation (LFM) signal in white Gaussian noise. Our study confirms that the IGACI algorithm based on coefficient adjustment is better than the original IGACI. The technique is used in the adaptive line enhancer (ALE). Simulation results show feasibility of the proposed algorithm.