With　the　development　of　blockchain　and　digital　currencies,　central　banks　all　over　the　world　are　accelerating　the　process　of　CBDC　development.　However,　it　is　still　controversial　on　adoption　of　blockchain　in　CBDC　design.　In　the　paper,　we　analyze　both　functional　and　non-functional　requirements　of　CBDC　design,　and　make　a　literature　review　on　blockchain　based　CBDC　schemes.　Analysis　findings　show　that　permissioned　blockchain　is　more　suitable　for　CBDC　than　permissionless　blockchain.　Besides,　there　are　some　challenges　in　blockchain　based　CBDC,　such　as　performance,　scalability,　and　cross-chain　interoperability.　Our　analysis　is　timely　and　can　provide　guidelines　for　blockchain　based　CBDC　design.　©　2021　The　Authors