The 1st Conference of the Asia-Pacific Chapter of the Association for Computational Linguistics and the 10th International Joint Conference on Natural Language Processing (AACL-IJCNLP 2020) will be held as a virtual conference from December 4th to December 7th, 2020. The organization committee from Soochow University will work with Program Chairs and Remote Presentation Chairs to promote a stimulating and lively experience. The conference invites the submission of long and short papers on substantial, original, and unpublished research in all aspects of natural language processing. Accepted papers will be presented as oral talks or posters. AACL-IJCNLP 2020 has a goal of a diverse technical program. In addition to traditional research results, papers may present negative findings, survey an area, announce the creation of a new resource, argue a position, and report novel linguistic insights. All accepted papers must be presented at the conference to appear in the proceedings. At least one author of each accepted paper must register for AACL-IJCNLP 2020 by the early registration deadline.