  We carry out a project to independently measure the distances of supernova
remnants (SNRs) in the first quadrant of the Galaxy. In this project, red clump
(RC) stars are used as standard candles and extinction probes to build the
optical extinction (A$_V$) - distance(D) relation in each direction of
extinction-known SNRs. 15 SNRs' distances are well determined. Among them, the
distances of G65.8-0.5, G66.0-0.0 and G67.6+0.9 are given for the first time.
We also obtain 32 upper/lower limits of distances, and the distances to
G5.7-0.1, G15.1-1.6, G28.8+1.5 and G78.2+2.1 are constrained. Most of the
distances measured by the RC method are consistent with previous results. The
RC method provides an independent access to the distances of SNRs.
