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We present a careful assess of the forced field extrapolation using SolarDynamics Observatory/Helioseismic and Magnetic Imager (SDO/HMI) magnetogram.The convergence property is checked by several metrics. The extrapolated fieldlines below 3600km appear to be aligned with most Halpha fibrils observed byNew Vacuum Solar Telescope (NVST). In the region where magnetic energy farlarger than potential energy, field lines computed by forced fieldextrapolation still consistent with the patterns of Halpha fibrils whilenon-linear force free field (NLFFF) results show large misalignment. Thehorizontal average of lorentz force ratio shows the forced region whereforce-free assumption is failed can reach the height of $1400-1800km$. Thenon-force-free state of the chromosphere is also confirmed by recent radiationmagnetohydrodynamics (MHD) simulation.

Forced field extrapolation of the magnetic structure of the Halpha fibrils in solar chromosphere