The purpose of the study is to investigate the factors affecting performance of vulnerable children projects with specific objectives, to establish how project planning, project financial resources, Project human resources and project monitoring & evaluation affect performance of vulnerable children projects in Lurambi constituency Kakamega County. The study applied stratified random sampling and descriptive survey design targeting a population of all the 12 orphans and vulnerable projects in Kakamega county comparing 120 employees. A total of 52 structured questionnaires were distributed to the eleven OVC projects. Questionnaire were used to collect primary data. Descriptive data analysis entailed counts, percentages, cross tabulations and measures of central tendencies. Results presented by pie-charts, bar graphs and tables. The study found out that Good Project planning determines the success of a project, Skilled human resource influences the success of a project, that regular and adequate budget allocation increases project success and finally that regular monitoring and feedback improves chances of project success as indicated by the mean scores of 3.29, 3.49, 4.00 and 3.32 respectively. Based on significance values, the study found out that project human resource significantly explains the project success as indicated by the significance value of 0.01. All together the four independent variables explain 70% of dependent variable. The study recommends that projects to succeed, good Project planning, skilled human resource and finally that regular monitoring & feedback are important.