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We first obtain the detailed expansion of the first Melnikov function by computing its generators for [Formula: see text]. Then by using the expansion, we give the upper bounds for the number of limit cycles bifurcating from each period annulus for two cases: [Formula: see text] [Formula: see text] [Formula: see text] and [Formula: see text] [Formula: see text]. <\/jats:p>","DOI":"10.1142\/s0218127421500954","type":"journal-article","created":{"date-parts":[[2021,5,28]],"date-time":"2021-05-28T08:30:07Z","timestamp":1622190607000},"page":"2150095","source":"Crossref","is-referenced-by-count":1,"title":["Limit Cycles of a Kind of Nonsmooth Differential Systems with Two Switching Lines"],"prefix":"10.1142","volume":"31","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6738-2777","authenticated-orcid":false,"given":"Jihua","family":"Yang","sequence":"first","affiliation":[{"name":"School of Mathematics and Computer Science, Ningxia Normal University, Xueyuan Rd. Guyuan, Ningxia, P. R. 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