Comprehensive evaluation on exploration effectiveness is important in exploration management and decision-making analysis.However，the commonly used evaluation indicators and methods are dull and cannot fully reflect the actual exploration effectiveness.Thus，it is essential to find out the key indicators affecting the comprehensive evaluation，build a reasonable evaluation model，and provide some effective methods to comprehensively evaluate exploration effectiveness. In this study，the key factors affecting exploration effectiveness were analyzed，and a comprehensive evaluation system for hydrocarbon exploration effectiveness was established，containing five categories and nine sub-indicators. A comprehensive evaluation model based on the entropy weight method and improved radar chart method was hereby put forward. Moreover，the combination of the indicator system and the evaluation model constituted a quantitative approach to evaluating the hydrocarbon exploration effectiveness with the improved radar chart method as the core. This method can be used to evaluate the effectiveness at various exploration periods，in different exploration domains，as well as of different types of gas reservoirs in a comprehensive manner. The results show that①the exploration effectiveness becomes higher as time goes on；②for gas reservoir types，the exploration effectiveness of compound reservoirs is superior while that of pure lithological and structural reservoirs is poor；③for exploration domains，the exploration effectiveness in the Sinian Lower Paleozoic registers the best，whereas it is relatively poor in Leikoupo and Jialingjiang Formations and the Carboniferous. In general，the evaluated results are consistent with the actual exploration，which means the proposed method can make an objective evaluation of the comprehensive exploration effectiveness.