In order to solve the low precision of delay-time and bad long-storage property of delay composition,the delay-time precisions of B-BaCrO_４ delay composition pressed by wet method and dry method were studied with high-low temperature test and long-storage test. The results show that the delay-time precision of B-BaCrO₄ delay composition pressed by wet method is better than that by dry method at the room temperature,high or low temperature （-6 ℃,60 ℃）or in long-storage test（70 d）.