49°N,the alpine pastoral area of northwestern Tibet is known as the ridge of the roof of world with a mean elevation of 4500 m.

In order to verify Qinghai fine-wool sheep’s reproductive capacity in alpine pastoral area,the pregnancy rate,the litter size,the survival rate of lambs and the lamb birth weight of different groups of Qinghai fine-wool sheep between 2.

Primary report of perennial legume introduction trial in alpine pasture of Minxian County;

Lolium multiflorum introduction to alpine pasture land;

Unreasonable industry structure is the bottleneck which constrains the development of alpine pasture economy.

The making of PGPR bacterial fertilizer and its effect on the height of three gramineous forage crops in seedling stage in alpine region;

The establishment experiment of annual mixed artificial grassland in alpine region;

A study on techniques of oat cultivation and production in the alpine region;

As far as the conditions of primarily cultivated forage legumes lack in Northwest Sichuan alpine pastoral regions,some reasons are probed into;and comprehensive solutions are also put forward.