As of the week ended in May 15th 2015, the prices in international oilseeds market experienced ups and downs, in which: the price for soybean in US as well as Argentina fell down, as the demand and supply data for May provided by US Department of Agriculture is bad news for soybean market. The seeding of soybean in US progressed smoothly, it is predicted by private institution that the seeding area of soybean in US is higher than the expectation of US Department of Agriculture, which also brings pressure for the market. It is proved by meteorological institutes in various countries that Nino phenomenon has occurred this year, which indicates the weather in the soybean growth period would in favor of the soybean growth. This is also a piece of bad news for the soybean price.