The Xiarihamu deposit is the first superlarge magmatic liquation type Cu-Ni sulfide deposit discovered in recent years in East Kunlung area of Qinghai Province. During the process of its discovery and evaluation, the integrated geochemical exploration methods played the most important role. Based on the systematic evaluation of 1:200 000 stream sediment anomaly→1:50 000 geochemical characteristics of stream sediments→1:10 000 composite anomaly→combinational method of geology and engineering verification, the authors found that 1:200 000 stream sediment survey could approximately delineate the prospecting target, but the corresponding geological work failed to find the Cu-Ni ore-related basic and ultrabasic rock bodies, and the origin of the anomaly could not be determined. 1:50 000 stream sediment survey further decomposed the 1:200 000 stream sediment anomaly. The corresponding geological work found some basic-ultrabasic rock bodies related to Cu-Ni ore, but the ore potentiality needs further confirmation. The 1:10 000 soil survey further reduced the prospecting target, and supported by the 1:10 000 geological sketching, the main causes of anomaly were detected and the ore-bearing basic-ultrabasic rock bodies were delineated in detail. All of these results have provided the direct basis for further engineering verification. It is held that this combinational method is the most economical and fastest way to find the orebody, and the results obtained by the authors could be regarded as an example to evaluate some deposits similar to the Xiarihamu deposit in the metallogenic belt.