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The demand for high thermal stability and high strength agents is growing steadily as a result of their increasing application in advanced materials.A series of sulfonated poly(m-phenyleneisophthalamide) (SPMIA) copolymers with superior thermal stability and good mechanical properties have been prepared via low temperature polycondensation method.Then the structures of SPMIA copolymers with different content quantities of 2,4-diaminobenzenesulfonic acid (2,4-DABSA) were confirmed by Fourier transform infrared (FTIR).Besides,their superior thermal properties were systematically investigated by differential scanning calorimetry (DSC),thermalgravimetreic analysis (TGA),and dynamic mechanical analysis (DMA).SPMIA fibers were obtained by wet spinning using the resultant SPMIA solutions.In addition,the obtained SPMIA fibers were proved to combine enhanced mechanical properties and unprecedented dyeability.Significantly,the SPMIA fiber with great mechanical property,thermal stability,and dyeability shows great potential in easily dyeing high-performance protective fibers.