Started in December 2015, MathSciDoc: an Archive for Mathematicians (abbreviated as MathSciDoc below) is an automated electronic archive and distribution server for mathematical articles. The covered areas of MathSciDoc include all aspects of mathematic. The purpose of MathSciDoc is to make all mathematicians to be closer to each other: by knowing what our friends do, and accessing papers easily. MathSciDoc is maintained and operated by Yau Mathematical Sciences Center of Tsinghua University. All MathSciDoc submissions are freely available to others. Only registered users can upload their submissions, comment to other registered user's submissions and respond.