The processing advantage of Subject-gapped relative clause (SRC) versus Object-gapped relative clause (ORC) has been advocated by competing processing accounts. Using a self-paced listening paradigm, this study investigates what Chinese RC online processing asymmetry looks like under concurrent memory load manipulation. Both On-line listening times and Post-online measures of Chinese SRCs and ORCs are estimated and compared. The on-line results show that ORCs and SRCs demonstrate no differential processing patterns under the interfering conditions. At the relativizer-DE marker region, under 0-digt-load, SRCs show processing advantage, while under 5-digit-load condition, SRCs display greater listening times than ORCs. Furthermore, the Post-online RTs and accuracy of post-sentence comprehension and digit recalls show that processing of SRCs had worse performance. These results lead to the conjecture that there may be no intrinsic processing asymmetry in Chinese RCs, and underscore the necessity that future studies in exploring the processing metrics of sentence complexity should consider the working memory involvement.