本发明的特征是,本发明高内压高负荷子午线充气轮胎具有至少1层绕一对钢丝圈从内向外反包的内侧胎体帘布层和至少1层从钢丝圈外侧向内侧正包的外侧胎体帘布层。胎体帘布层由相互平行排列的有机纤维帘线构成。胎体帘线与轮胎胎面中心线构成的角度为70~90o。胎体帘布层帘线为尼龙66帘线,其聚对苯二甲酰己二胺的结构单位为95克分子%以上,合股后经粘合剂处理的浸渍帘线的强度(S)为9.0 dg/d以上,起始模量(M)为80 g/d以下。 The present invention is characterized in that the high internal pressure and high load radial pneumatic tire according to the present invention comprises at least one inner carcass ply wrapped around the pair of traveler from the inside to the outside and at least one outer side covered with the inner bag from the outer side to the inner side of the traveler Carcass ply. The carcass ply consists of organic fiber cords arranged parallel to each other. The angle formed by the carcass cord and the tread centerline is 70 ~ 90o. The carcass ply cords are nylon 66 cords whose structural units of polyhexamethylene terephthalamide are above 95 mol% and the strength (S) of the impregnated cords after binder bonding is 9.0 dg / d or more, and an initial modulus (M) of 80 g / d or less.