Based on the analysis of frequency spectrum of Faraday angle in blue and violet light ranges for BiAlDyIG materials, we have perpared a fine quality BiAlDyIG thin film by a pyrolysis method and crystalized the film with rapid recurrent thermal annealing. The effective Faraday angle of RRTA sample is over about 0.5 degree larger than that of the common samples, and its Faraday angle increases with the number of recurrent annealing increasing, which is due to the finess of the grain and many Bi 3+ -O 2- -Fe3+ are informed. Meanwhile, the concentration variation of Al3+ions in octahedral and tetrahedral sites results in a decrease of curie temerature (140～160℃). These results are very promising for improving the recirding density and signal-noise-ratio.