While Sino-Russian STC is an important field of cooperation under the background of strategic cooperative relationship in the 21st century between China and Russia,it's essential to establish rational strategy and policy of STC,which should be based on evaluation of technological strength and future potential.Based on connotation of technological potential,this paper has established a index system of technological potential evaluation and implemented an evaluation and comparative analysis between China and Russia by using weighted principal components TOPSIS valuation function model.The research result will be a good reference for the establishment of strategy and policy of STC.