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Filling repeated mining technology of small coal mines mainly researches on the gob or cavity in the coal seam formed by the mining method of small coal mines. Adopting the means of field exploration, indoor test, the simulation experiment, pumping filling material that is stable in mechanical property and low in price into the gob, it can meet the needs of normal mining and achieves the purpose of mining safety and efficiency. The keys of this technology are detecting, the stability and controlling method of the surrounding rock, management and safe-efficient mining process technology. The gob of small coal mines in B909 working face of Anjialing No.2 underground coal mine affected the advancing of the working face. In view of this situation, the detecting method and solution were researched. The results showed that, combining geophysical exploration and the trinity of detecting, releasing, controlling, ae specific location of the goal could be mastered accurately and the harmful factors could be removed. According to the characteristic of recovery, the suitable filling material and scheme were chosen to deal with the gob by grouting. This guaranteed the stability of the surrounding rock and the coal in the period of mining. These methods mentioned above realized the safely and efficiently mining of the coal seam affected by the gob of small coal mines and provided experiences to the coal resource exploitation of similar condition.