Abstract: The main ecological factors were studied in the young(3a) and middle-aged(5a) rubber plantations intercropped mulberry—Marus migriformis Koidz (MMK).. It indicated that: (1) The growth of rubber trees were increased in this intercropping pattern; (2) It was effective to decrease temperature of the rubber plantation in summer, increase the atmospherical moisture content and water content in soil; (3) It was also effective to improve the soil condition and increase its usable phosphor content. Therefore, “Rubber tree-Mulberry” intercropping system can create favorable ecological effects, and improve the micro-environment of rubber ecological system.