Abstract: Psylla Chinese Yang et Li was a new introduction fatalness pest in Xinjiang, China. In order to reduce loss，we measured off meteorological grades of calamity caused byPsylla ChineseYang et Li. A forecasting model of eggs of Psylla Chinesewas built by using meteorological conditions which were firmly connected with the development of Psylla Chinese through actual investigation data and historical meteorological data. The results showed that high temperature was the major meteorological factor that could obstacle the development of  Psylla Chinesefrom 2000 to 2002 and in 2010. The development rate of Psylla Chineseincreased quickly with temperature increased under 22.5℃, and increased slowly with temperature increased above 22.5℃, restraining when temperature increased to 35℃.The model was tested and confirmed well with the occurrence of Psylla Chinesefrom 2000 to 2002 and in 2010.This provided scientific basis for effective prevention on  Psylla Chinese. And it had important guidance significance for prevention and reduction disaster and sustainable development of agriculture practice.

Key words: font-family: 宋体, mso-bidi-font-family: 宋体, mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA">Psylla Chinesefont-family: 宋体, mso-ascii-font-family: MingLiU_HKSCS, mso-hansi-font-family: MingLiU_HKSCS, mso-bidi-font-family: MingLiU_HKSCS, mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA">font-family: 宋体, mso-bidi-font-family: 宋体, mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA"> Yang et Li, font-family: 宋体, mso-bidi-font-family: 宋体, mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA"> Occurrence, Meteorological grades