Abstract: A 4N Ha solar flare occurred on April 1, 1981, and accompanied with strong type IVradio burst. This paper analyses the radio data of the burst obtained at Beijing Observatory and Lear-month Observatory. The result shows that:1. The microwave source of the event is relatively stable, but the source at meter waves moves. There seems to be two electron populations responsible for microwave and meterwave radiations, respectively. The time difference between the microwave peaks and meterwave peaks is believed to be due to the different positions of the two kinds of sources.2. On April 1, 1981 the great microwave burst consists of three major bursts. The times of flux peaks are 0135.1 UT, 0146:1 UTand 0153.6 UT, respectively. The non-thermal electron spectral indices calculated at the high frequency end of the radio spectra show that the electron spectra become harder at peaks. For this burst, the calculated, average non-thermal electron speed is about 0.9c (c is light speed) and the magnetic field stre out 430G. Using the assumption of damping radiation of gyro-synchrotron, the calculated mean life of the non-thermal electrons is 829 second, which is consistent with the duration of the three major bursts.