  Small radio telescope in 21cm was used for studying the partial solar
eclipse, with magnitude 0.89, in Hong Kong on 21st June, 2020. The radio
telescope SPIDER 300A was designed and constructed by the Radio2Space Company,
Italy. Radio flux density time curves (light curve) and a two-dimension mapping
of the eclipse is presented in this paper. Standard radio data reduction
methods were used to obtain the intensity time curve. We also adopted the
semi-pipeline method for the reduction of data to obtain the same results as
with the built-in software of the radio telescope SPIDER 300A. The total solar
radio flux of the eclipse was found to reduce by maximum 55 +/- 5 percent,
while the maximum eclipsed area of the same eclipse is 86.08%. Other radio
observations of solar eclipses in Hong Kong are also discussed in this paper,
including SPIDER 300A observation of partial solar eclipse on 26th December
2019 (APPENDIX A); and small radio telescope (SRT), developed by the Haystack
Observatory, MIT, USA, observation of 2020 eclipse (APPENDIX B).
