CAR-T cell therapy is one of the most successful cell-based therapies. T cells are the most common cells to be genetically modified for cancer therapy, not only because T cells have cytotoxicity but also because they are easily cultured ex vivo and genetically modified with viral vectors. Hence, for nonexperts, T cell engineering is an ideal starting point for mammalian cell engineering or for development of therapeutics. Here, we have described a basic procedure for lentiviral transduction of human primary T cells to generate a CAR-T cell and assays to confirm CAR expression and function.