Abstract: Based on the data of date tests on paddy rice Yunhui 290 in the Yunnan plateau,the effect of meteorological conditions to the starch content of rice was studied to identify the key factors and growing period.A comprehensive climatic-ecological model on the starch content of rice was developed.The results showed that the amylase content was positively related to the temperature,but related to the sunshine hour in a parabola form.The key period was between 15 days before heading and 5 days after heading.The amylopectin content was related to the temperature in a parabola form and the key period was between 10 days before heading and 15 days after heading,while it was positively to the sunshine hour and the key period was between 15 days before heading to 5 days after heading.With increasing of the sunshine hour,the amylopectin content increased.

Key words: Yunhui 290, Yunhui 290, Starch content, Meteorological condition, Relationship