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Abstract-This paper presents a new scheme for data mining in spacecraft state association and abnormal detection. A method which includes state association knowledge mining (SAKM) and Similar Density Merge Clustering (SDMC) is developed. Data from the satellite are the most critical thing for analyzing satellite state and abnormal detection, therefore correct analyze of the regulation is quintessential for the detection of satellite abnormal detection. The associations in any of the subsystems are known when satellite was designed; however, the associations between any two of the subsystems are to be found. In such cases a SAKM algorithm becomes essential for obtaining the correct regulation. Clustering algorithm such as K-means is important in the SAKM algorithm, although it has its own limitations; however in this paper a novel method has been proposed for conditioning of Kmeans method. So that it can be effectively used for regulation discovery of data and satellite abnormal detection. The SDMC approach involves determination of classes' centers from the classes established by K-means method. In this way the points in one class are close enough. The high similarity points fall into the same class while the low similarity points fall into the different class based on the SDMC algorithm, the SAKM algorithm use Apriori algorithm mining frequent item sets and association rules of parameter feature characters. The experimental results show that as compared to the K-means algorithm the SDMC method can effectively cluster the data, the SAKM algorithm can correctly mining the satellite association knowledge.

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