Abstract：Historical supernova remnants (SNRs) are remnants of nearby supernovae (SNe) that were seen and recorded by ancient people.  Despite of the small number, historical SNRs play a unique role in understanding the physics in SNRs and SN explosion mechanisms. Ancient Chinese texts provide the most complete records of nearby SN explosions, although the values of these records have not been fully exploited. After a brief review of the historical SNRs in the past two millennia, I will talk about the story of the guest star in AD 386 and our recent discovery about its probable debris—SNR G7.7-3.7, which is likely resulted from a rare low-luminosity SN explosion. I will also introduce our molecular observations of Cassiopeia A, a famous, young SNR, and explain why its SN explosion was probably not recorded in the 17th century.