As the labor market pressure for college graduates keeps rising in the past decade, working while attending college becomes increasingly popular among undergraduate students in China. With a nationally representative dataset of 6,977 students from 49 institutions, this study examines the incidence and influencing factors on undergraduate student term-time working in four-year universities and colleges in China. Overall, the paper finds that: 1) 63% of undergraduate students work for about 23 hours per week in academic semesters for an average of 5.7 months in college; 2) student term-time working pattern (i.e. participation, length, and intensity) differs across forms of work, and varies by types of institution; 3) students' non-academic ability, financial constraint, and institutional environment jointly influence the participation and intensity of term-time working. The findings provide implications to policies regarding financial and developmental support to undergraduate students.