Calcium Folinate Treatment of Spastic Paraplegia 56

Inclusion Criteria: 1. Patients meet the clinical diagnostic standard of hereditary spastic paraplegia (HSP); 2. Spastic paraplegia type 56 (SPG56) was diagnosed by CYP2U1 pathogenic mutation; 3. Patients are willing to participate in clinical trials and able to understand and comply with the research program. Exclusion Criteria: 1. Patients are allergic to the drugs involved in the study; 2. Other neurological diseases likely affecting the evaluation of study treatment; 3. Other medical conditions such as: heart disease, tumor, blood disease, liver disease, kidney disease, etc. in the past 1 year; 4. Pregnancy or lactating women or subjects who are unable to use appropriate contraception during the trial; 5. Participating in another study drug trial and used the investigational drug in the past 30 days; 6. Subjects have poor compliance or other factors that are not suitable for participating in the clinical trial.