[Objective]The paper was to understand species of diseases,pests and weeds and their occurrence periods and dynamic changes of quantity during corn growing period in rainy and dry seasons in Angola.[Method]Using systematic investigation method,the species and occurrence regularity of diseases,pests and weeds of corn in Pedras Negras farm(Malanje),Sanza Pombo farm(Uige)and Catete farm(Luanda)in the African continent,the Republic of Angola,were studied in two dry seasons and a rainy season from 2011 to 2012.[Result]The occurrence status of pests and diseases of corn during dry and rainy seasons were basically similar,and only individual diseases and pests had different incidence degrees.The corn varieties from the United States and Brazil had prominent advantages in resistance to diseases and barren.Due to different climate environments in dry and rainy seasons,the unearthed rate of weeds in fields was also different.Soil moisture had great impact on weed population and density.Soil layer depth greatly influenced unearthed speed and unearthed rate of weeds.[Conclusion]The study cleared species,occurrence period and harmful levels of pests,diseases and weeds of corn in three provinces of Angola. [Objective] The paper was to understand species of diseases, pests and weeds and their occurrence periods and dynamic changes of quantity during corn growing period in rainy and dry seasons in Angola. [Method] Using systematic investigation method, the species and occurrence regularity of diseases, pests and weeds of corn in Pedras Negras farm (Malanje), Sanza Pombo farm (Uige) and Catete farm (Luanda) in the African continent, the Republic of Angola, were studied in two dry seasons and a rainy season from 2011 to The occurrence status of pests and diseases of corn during dry and rainy seasons were similar to and only individual diseases and pests had different incidence degrees. Corn varieties from the United States and Brazil had prominent advantages in resistance to diseases and barren.Due to different climate environments in dry and rainy seasons, the unearthed rate of weeds in fields was also different.Soil moisture had great impact on weed population and density.Soil laye r depth greatly considered unearthed speed and unearthed rate of weeds. [Conclusion] The study cleared species, occurrence period and harmful levels of pests, diseases and weeds of corn in three provinces of Angola.