Abstract: In order to explore the disease of cotton growth, yield and quality of influence, in order to provide the basis for comprehensive treatment measures according to. Through the use of Macao as ecological instrument co., LTD of chlorophyll meter SPAD-502, test diseased plants and normal strain upper the first and the second quarter main stem leaf and flowering of the first leaf chlorophyll content, and the results show that: the initial plant of upper leaf chlorophyll content below the normal strain, over time, the difference between a narrow. Through the survey measurement varieties (strains) with the pathogenesis of strain and normal strain growth situation, the results showed that, early onset of plant flowering plant height and number than the normal strain significantly reduced, come on later, plant height and branch number than the normal strain reduced but not obvious. No matter the plant of morning and evening, 7-8 standard of performance for a large number of young budding off, this and other diseases caused by cotton young fluid rather than young budding off significantly different. The second was plant of big bell, bell off increase and decrease flowers. Through the picking harvest diseases plants and normal strains respectively unginned cotton and weighing rolling son calculation, all diseases plants were performing different levels of production. Through the plant materials would cut its proportion of the strain rate hook measure, the results indicated that, all varieties (strains) reduction ratio and the onset of strain rate were positively correlated (coefficient R=0.98), its fitting regression equation for Y=1.180+0.852X. Through the varieties (strains) with plant and normal plant fibers as the professional testing, the results showed that, the plant fiber quality drops obviously, especially in each value the greatest reduction. Explain the maturity of the cotton boll plant growth course of change. Observation test results showed that, the cotton plant physiological mechanism change, resulting in lower chlorophyll content, lower plant height, branch to reduce, the young budding off and young fluid off increase, resulting in the boll reduce production, also caused the plant fiber maturity down. The earlier of the impact, the greater the strain rate, the higher the cut loss.