Poverty Alleviation Development is an important project implemented for changing Tibet’s backward situation by Central Government, as a result, the backwardness of Tibet’s economy and the importance of the development of Tibet’s economy determine that the logic mechanism of poverty alleviation development and economic development of Tibet are the interaction of national-led and local response. The national-led issue mainly embodies “Tibet being supported by other provinces”, and local response is chiefly carried out by village reconstruction and development of specific economy and so on. The interaction of national-led and local response has made obvious achievement in poverty alleviation development models, either“Tibet being supported by other provinces”or Tibet self exploration has made greatly-known progress, although the poverty alleviation development model of the interaction of national-led and local response has the defects such as low efficiency of the projects supporting Tibet, low participation extent of local peasants and herdsman and so on, it is of important significance to leapfrogging development of Tibet’s economy and society, and this model will continue. China should set up budget constraint to really raise the efficiency of the projects supporting Tibet, change the mode of Tibet-supporting from“outsiders”to“participants”, and further consolidate Tibet’s self development capacity.