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We investigated the effect of ZnO filler on the microstructure of BaO-B2O3-ZnO-P2O5 glass system to find an etching mechanism of barrier ribs. The sintering behavior of composites heated in the temperature range 560-600oC was studied by volumetric shrinkage rate and microstructure. The etching test was carried out in HNO3 solution at 50oC for 10min. The volumetric shrinkage of sintered sample decreased with the increased firing temperature because of the formation of two crystals. Glass and ZnO filler react forming the BaZn2(PO4)2 crystal phases during the sintering process. Etching phenomenon of sintered samples by HNO3 showed that the BaZn2(PO4)2 crystal phase was strongly leached compared to glass matrix, crystal phases and fillers. Therefore, the control of interface by condition of sintering is so important to achieve etching effect in barrier ribs.