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In the long-distance fiber-based frequency transmission, the traditional dispersion compensation method is dispersion compensating fiber, but there exist problems of high insertion loss, high latency and large footprint. Our research group propose a dispersion correction method based on chirped fiber Bragg grating (CFBG), which has the advantages of lower insertion loss, lower time delay and smaller size than using DCF. Based on the CFBG, the research group achieved high-precision dissemination of atomic clock signals on a 310-km urban optical fiber link from Tsinghua University to Zhangjiakou city, one of the host cities for the 2022 Beijing Winter Olympics. Furthermore, the CFBG-enhanced bidirectional erbium-doped fiber amplifier (Bi-EDFA) is proposed to optimize the dissemination performance and extend the frequency dissemination distance to 500km, which demonstrates the potential and applicability of the dispersion correction-based frequency dissemination system. The relevant word has been published in IEEE Transactions on Instrumentation and Measurement. (Yufeng Chen, Hongfei Dai, Hongwei Si, Fangmin Wang, Bo Wang*, and Lijun Wang. Long-haul High Precision Frequency Dissemination based on Dispersion Correction. IEEE Transactions on Instrumentation and Measurement, 71,5503207,2022.)