Abstract: 【Objective】 To clarify the effects of sowing dates and fertilizer types on the occurrence dynamics of Sitobion avenae in the field, so as to provide technical support for the rational use of pesticides and scientific control of wheat aphids. 【Method】 Random block design and regular and fixed-point investigation were conducted to record the number of Sitobion avenae in the occurrence period of Sitobion avenae. 【Result】 Different sowing dates and survey time had significant effects on the AP values.The AP values of the late sowing treatments from May 19 to June 8 were 3.40, 5.82, 5.44, 2.32 and 0.00, respectively, which were significantly lower than those of the regular sowing treatments.Different fertilizer application treatments and survey time both had significant effects on the AP values.The AP values of the treatment of organic fertilizer replacing nitrogen fertilizer by 60%, 40% and 20% in late sowing fields were 4.83, 4.70 and 4.11 respectively, which were significantly higher than those of the treatment of inorganic fertilizer treatment in late sowing fields. 【Conclusion】 Compared with the regular sowing treatment, the late sowing treatment can significantly reduce the populations of S.avenae.Organic fertilizer replacing nitrogen fertilizer is benefit to feed S.avenae, and the higher the proportion of nitrogen fertilizer replaced, the bigger the population of the wheat aphid would be.