The impacts of wind power integrating into power systems has a dual effect. The positive and negative benefits of wind power should be comprehensively considered， thus can get the reasonable reserve requirements allocation results of power system with wind power. Moreover， as one type of generations， wind power can be used as a spinning reserve provider， and it needs to be considered in the determination of spinning reserves. This paper first analyzes the impacts of wind power integration on power system operation， then formulates a unit commitment model that captures the comprehensive benefits of wind power on system economies and CO2emission reductions. Furthermore， a simulation system characterizing features of the wind-thermal power systems is adopted to analyze and compare several methods for the determination of spinning reserves. Finally， focus on the concerned questions in practical systems such as the impact of different wind accommodation options on the system economies and CO2emission reductions， and the feasibility of wind power as a spinning reserve provider， the methods suitable for the determination of spinning reserves in wind-thermal power system are discussed， and suggestions on wind power accommodation in wind-thermal power systems are also proposed.