Analysis and forecast through linear neural network model find that GDP gap is not large before the middle of the 1980s between east and west part of China but since the late 1980s the GDP gap becomes larger and larger between them,especially in the 1990s,from 1991 to 2000,the GDPgrowth rate of the east part is very higher than that of east part,which shows the performance of western development and Chongqing becoming municipality,especially in 2004,2005 and 2006,the growth rate of either per capita GDP or total GDP in west part surpasses that of east part,which shows the performance of western develoopment and Chongqing becoming municipality in narrowing the gap between east and west part of China and which reveals the opportunity in the rapid economic development of the west part.The analysis and forecast through neural network mathematical modeling indicate that present economic difference between east and west part of China stays at the middle period of double S curve model,thus,we must take this historic opportunity to narrow the gap,make full use of the development law that successors excel predecessors to accelerate the economic development of the west part of China.