Abstract: To meet the demand for our high yield and high starch sweet potato new varieties and cultivation techniques of new varieties, Yantai Academy of Agricultural Scientific Research utilize the way of improved- hybridization to breed the new variety, and adopt the national and regional test to appraise the yield, quality, disease resistance. The mulching cultivation technology research of new varieties was done by field contrast experiment analysis. The regional test results from the Northern district in 2008-2009 showed that, its average yield of fresh foot was 32235 kg/hm2, 9.46% increase compared with contrast and the average yield of the dry weight was 9685.5 kg/hm2, 18.55% increase compared with contrast. It passed the identification by the identification committee of the national sweet potato varieties in 2010. Study obtained: ‘YanShu 24’ had the advantages of high yield, high starch content, strong disease resistance and the wide adaptability. It was an excellent variety to process starch. The black plastic film mulching had the best effect. It was mainly because of the great advantage that the black film mulching could inhibit the growth of weeds, did not need spraying of herbicides and avoid inhibition growth of stems and leaves by the herbicide. Because of suitable soil temperature root growing was not affected by pre-ground high temperature. Stems and leaves and root growth dynamics, the dynamics of leaf area index, T/R value was reasonable. So it was able to obtain higher economic output.