Abstract: Under-forestry economy is a new economic growth point of modern agriculture. Recent years, the under-forestry economy in mountain area in Beijing. has acquired significant achievements. It has formed some representative models, promoted forestry farmers obtaining employment and increased their earnings. So far under-forestry is in primary stage in mountain area in Beijing. There is some serious problem in the process of developing under-forestry. The paper depicts the current situation about under-forestry economy in mountain area in Beijing and analyses the advantages and disadvantages of under-forestry economy in mountain area in Beijing. At last, the paper gives proposals from different points of view.