Abstract: In this paper, the influences of sintering curves, sintered saggar and buried power sintering on the surface holes and micro-morphology of multi-layer ceramic capacitive filters are systematically analyzed, and the sintering mechanism of BaTiO₃ based ceramic material was deeply researched. The results of process experiments reveal that the sintering densification of the filter can be improved by optimizing the sintering curve. Meanwhile, the problem of surface holes can be solved by using coated saggar and prefabrication powder buried firing. By optimizing the sintering temperature, holding time and heating rate, the strength and densification of the porcelain body were improved. The coated saggar is made of the base ceramic material after pulping to isolate the contact between the product and saggar, preventing the formation of bule CoAl₂O₄ spinel impurities. The prefabricated powder is prepared by the matrix material after granulation for buried firing, which provides a low oxygen partial pressure atmosphere for the filter sintering, and speed up the densification process in the initial sintering stage, so that the pores in the initial sintering stage are transferred to the grain boundary. This is conducive to later discharge. The presnet work solved the problem of holes on the surface of porcelain body, which can provide some valuable references for solving the similar problems in the sintering process of electronic components.