In order to determine the main types of pollution origins of the heavy metals of sediments of Lake Donghu, Wuhan, based on principle of principal components and the rule of picked-up information which is over 84% of original ones, we have analyzed twelve elements of thirty representative samples of 0 -7 cm sediments of Lake Guozheng and Lake Tanglin, which are the main sub lake of Lake Donghu, Wuhan city. The results indicate that for Guozheng Lake sediments, the first pollution origin (56%) is industry coal dust around the lake, the second origins (16%) are tail gas, domestic sewage and rain flow, and the third parts(12%) are industry sewage with electroplate and press etc. For Lake Tanglin, the first pollution origin (65%) is atmosphere dust which is from industry coal combustion, the second origins (17%) are sewage with household, hospital and soil etc, and the third parts(9%) are disused battery, newspapers and farming materials etc. Employing the comprehensive pollution indexes of heavy metals, which were calculated by root mean square on the background values, to evaluate the pollution degree of sediments of main sublakes of Lake Donghu, it is found that both of them belong to light contamination and the pollution degree of Lake Guozheng is higher than that of Lake Tanglin.