Information aggregation is one of the basic means for information processing. This paper mainly discusses about behavior of several aggregation operators. Firstly, from the perspective of generalized adjunction, the properties of generalized aggregation operators are discussed. Given one aggregation operator A, two different methods are adopted to construct new aggregation operators greater (less) than or equal to A. Furthermore, several aggregation operators, such as bipolar t-norms and bipolar implications, are explored, and the condition is provided for bipolar aggregation operators to be decomposed into two unipolar aggregation operators. Under this condition, the aggregation processing for positive as well as negative information is also presented.