  Natural language processing (NLP) has been applied to various fields
including text classification and sentiment analysis. In the shared task of
sentiment analysis of code-mixed tweets, which is a part of the SemEval-2020
competition~\cite{patwa2020sentimix}, we preprocess datasets by replacing emoji
and deleting uncommon characters and so on, and then fine-tune the
Bidirectional Encoder Representation from Transformers(BERT) to perform the
best. After exhausting top3 submissions, Our team MeisterMorxrc achieves an
averaged F1 score of 0.730 in this task, and and our codalab username is
MeisterMorxrc.
