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Frequency hopping system is a common means of anti-jamming communication. The design of timing synchronization scheme needs to consider the characteristics of the system and has good performance under interference conditions. Based on the analysis of the timing performance of the system under interference conditions, a square timing synchronization algorithm based on energy ordering detection is proposed to solve the computational complexity of traditional continuous mean excision (CME) detection algorithm. The algorithm first detects the energy of the signal after de hopping, uses the detection results to remove the interference by sorting, and then performs timing error detection. Finally, it is used for demodulation by interpolation recovery, without multiple iterations to determine the detection threshold. The simulation results show that the improved algorithm has the same timing estimation performance as the traditional CME algorithm, and can meet the demodulation performance requirements of the system, resulting in a 1/2 reduction in the computational effort; Under different interference signal ratios and interference bandwidths, the normalized timing variance is less than 1 × 10-3, and the demodulation performance loss is less than 0.5dB.