[Objective] To establish the Restriction enzyme mediated integration(REMI) trans-formation system and a REMI transformants library of Lasiodiplodia theobromae.[Methods] REMI method was used to obtain transformants of L.theobromae.Linearized DNA of plasmid pUCATPH containing the hygromycin phosphotransferase gene(Hyg) was integrated into chro-mosomes of wild strain CSS-01s.Sensitive concentration of L.theobromae to hygromycin B was determined.Different enzymolysis systems and digest time on preparation of pr...