The resistances to Fusarium oxysporum f. sp. melonis race1 and Sphaerotheca fuliginea race 1 of 126 melon germplasm resources from China and abroad were identified by single and composite inoculations with spore suspension in seedling stage，respectively. The result indicated that under single inoculation condition，7 were highly resistant to Fusarium wilt，42 were resistant，61 were mid-resistant，15 were susceptible and 1 was highly susceptible．While 9 were highly resistant to powdery mildew，42 were resistant，72 were mid-resistant，and 3 were susceptible. Under composite inoculation condition，PI164331 introduced from Indian was screened as resistant to both Fusarium wilt and powdery mildew. Significant positive correlations were observed between the evaluation results of single inoculation and composite inoculation，though correlation analysis of these 2 methods.