Fragmentation function studies at BESIII

Fragmentation Functions play a crucial role in describing the hadronization process. We report the measurements of normalized differential cross sections of inclusive $\pi^0, K_s$, and $\eta$ production as a function of hadron momentum at six energy points with momentum transfers $q^2$ from 5 to 13 GeV$^2$ at BESIII. The results of $\pi^0$ and $K_s$ covering relative hadron energies from 0.1 to 0.9 significantly deviate from several theoretical calculations based on existing fragmentation functions.