The property of freeze-thaw resistance of concrete depends upon the concretes air content to a great extent, and the concrete aggregate of raw material is one of factors affecting air content. By the way of tests and studies on air content of concrete mix, the authors discuss the influence of aggregate on concrete mixs air-containing. The result shows as follows: The influence of aggregate on concrete mix's air content is decided by properties of aggregate.To the two aggregates described in this paper, aggregate gradation, powder and charcoal quantities are major factors affecting air-containing of concrete mix. Increasing concrete's air content by controlling aggregate quality and adjusting quantity of air-entraining agent can ensure freeze-thaw resistance of concrete.