In this paper, different tripartite barrier arrangement types are classified into five categories and their influence on tunneling effect is systematically investigated. The results show that different barrier arrangement types have different effects on the transmission coefficient. At high incident energy, the transmission coefficient of increasing barrier, decreasing barrier and low barrier on both sides of middle high are higher. At low incident energy, the transmission coefficients of the horizontal barrier and the high barrier on both sides of the middle low barrier show strong fluctuation. The transmission coefficients oscillate periodically at different barrier spacing, and all types have larger oscillation frequencies at higher incident energies. When the barrier width is small, the transmission coefficient of the increasing barrier exhibits periodic bimodal characteristics, and gradually becomes periodic unimodal structure with the decrease of incident energy. On the contrary, with the decrease of incident energy, the transmission coefficient of the decreasing barrier changes from periodic unimodal structure to periodic bimodal structure. In the case of high incident energy, the fluctuation amplitude of transmission coefficient remains unchanged with the increase of barrier width. On the contrary, with the increase of barrier width, the fluctuation amplitude of transmission coefficient increases sharply. In addition, the transmission resonance phenomena in five kinds of triple barrier arrays are systematically investigated. We find that resonant transmission can be realized under the condition that the barrier width is not 0. This study provides detailed theoretical results for understanding the quantum tunneling effect in tripartite barriers.
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