Abstract:The paper discusses the features of geological ages ,rocks association sequ ence,REE elements and trace elements for the Meosoic bimodal volcanic rocks in S outh Jiangxi and North Guangdogn. The paper considers the Meosoic bimodal volcan ic rocks form in intraplate environment .The midbasic volcanic rocks and mid ac idic volcanic rocks do not come from the same magma chamber. The former proceeds from the upper melting mantle and the later the lower melting earth crust.