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Nb3Sn has significant potential for superconducting radio-frequency (SRF) application in future particle accelerators, especially compact accelerators, which have attracted the attention of many scientific researchers. This work reports the setup and process of Nb3Sn coating at the Institute of High Energy Physics (IHEP), and presents the results of 1.3 GHz 1-cell cavities coated with Nb3Sn. The cavities had a matte, non-reflective gray visual appearance after coating. Various parameters were used in the coating processes of Nb3Sn cavities, which resulted in different performances. The characteristics of witness samples at different locations inside the cavity revealed the uniform quality of the Nb3Sn coating. Experimental results indicated that less defects and a smoother surface can result in an improved performance of cavity.
