We prove that when q is not equal to 5,9,13,17,25, and 29, there always exist solutions for the diagonal quartic equation ax^4+by^4=c over F_q.
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Cite this article as: HUANG Bao-Sheng, WU Rong-Jun, TAN Qian-Rong, ZHU Guang-Yan. On the existence of solutions of diagonal quartic equation ax^4+by^4=c over finite field [J]. J Sichuan Univ: Nat Sci Ed, 2022, 59: 011001.