From April to May, 2009, the research on source areas of early immigration of white-backed planthoppers (WBPH) Sogatella furcifera (Horváth) were conducted at five research stations located at five different areas in Yunnan province. Based on the analysis on the daily light-trap catches, field surveys, immigration trajectory simulation and meteorological background, the following conclusions can be drawn: (1) The main source areas of the early immigration of WBPH in 2009 were located in Myanmar, and the secondary source areas were at the Laos and Vietnam, and very few came from Imphal of India. (2) The low temperature shield of surrounding to flying WBPH and the wind shear associated with heavy precipitation were the key factors to affect the concentrated landing of WBPH. (3) The high frequency of westerly wind and the great increasing of rice planting in the source areas of Myanmar were the principal reasons that caused the mass immigration of WBPH to Yunnan in 2009.