AIM: To investigate the reasonableness test of different parts of Herba Asari. METHODS: HPLC method was used to determine aristolochic acid A content content in different parts of Herba Asari. RESULTS: Aristolochic acid A content in above-ground parts of Herba Asari was higher than that in the root,and aristolochic acid A was not detected ever in some Radix et Rhizoma Asari. CONCLUSION: It is more reasonable that the medicinal part of Herba Asari is selected from the root rather than who...