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Peony is China's one of the traditional flowers, peony producing areas such as Shandong Heze hot summers, high temperature and high light tends to make the peony leaves are dried up, seriously affect the accumulation of nutrients and strong bud formation, thereby affecting the quality of flowering, Observation and Analysis, may have occurred photoinhibition. In this paper, the traditional peony varieties, production widely Hong Hu and the Oolong holding Sheng materials, the use of gas exchange and chlorophyll fluorescence analysis field Peony throughout the growing season, the seasonal variation of photosynthetic characteristics and diurnal variation law; summer peony varying degrees of shading (shading 35% and 50%) treatment, the shade of the study on photosynthetic characteristics and chloroplast pigment content, the content of malondialdehyde (MDA), superoxide anion radical (O 2 -) production rate of hydrogen peroxide (H 2 O 2 ) content, superoxide dismutase (SOD) activity and peroxide catalase (CAT) activity of physiological and biochemical indexes. Designed to clear the growth and development of peony, to improve tree peony environmental conditions, photosynthetic capacity, increase the accumulation of photosynthetic products, provide a theoretical basis and application infrastructure for scientific cultivation of peony. The major findings are as follows: 1. Daejeon Peony photosynthetic characteristics has a strong seasonal variation. Spring (April, May and June) environmental conditions, such as light, temperature, air humidity, and so is ideal for the growth of Peony, Peony photosynthetic capacity of this period remained at a relatively high level, an important period of accumulation of photosynthetic products; summer (July and August), high temperature and high light peony in a dormant state, reduced photosynthetic capacity, light suppression; autumn (September and October), with the improvement of the environment photosynthetic capacity increased at first, and then with the peony leaf senescence. And gradually decreased. 2 field Peony has obvious diurnal variation. Spring and summer peony leaf net photosynthetic rate (Pn) There was significant difference: The Peony leaf spring Pn diurnal variation curve of a single peak at noon, a slight decrease. Summer under natural light Pn diurnal variation curve of \decreased peony in summer sunny day at noon, the optical system II (PS II) reaction center reversible inactivation of PS II function down photoinhibition. Peony field under the glare of the summer heat a strong membrane lipid peroxidation. Summer and spring
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